ABSTRACT
Background
Endothelial dysfunction is a predictive risk factor for the development of atherosclerosis and is assessed by flow-mediated dilation (FMD). Although it is known that NO-dependent endothelial dysfunction occurs after consuming a high-fat meal, the magnitude of the effect and the factors that affect the response are unquantified.
Objectives
We conducted a systematic review and meta-analysis exploring the quantitative effects of a single high-fat meal on endothelial function and determined the factors that modify the FMD response.
Methods
Six databases were systematically searched for original research published up to January 2022. Eligible studies measured fasting and postprandial FMD following consumption of a high-fat meal. Meta-regression was used to analyze the effect of moderator variables.
Results
There were 131 studies included, of which 90 were suitable for quantitative meta-analysis. A high-fat meal challenge transiently caused endothelial dysfunction, decreasing postprandial FMD at 2 hours [−1.02 percentage points (pp); 95% CI: −1.34 to −0.70 pp; P < 0.01; I2 = 93.3%], 3 hours [−1.04 pp; 95% CI: −1.48 to −0.59 pp; P < 0.001; I2 = 84.5%], and 4 hours [−1.19 pp; 95% CI: −1.53 to −0.84 pp; P < 0.01; I2 = 94.6%]. Younger, healthy-weight participants exhibited a greater postprandial reduction in the FMD percentage change than older, heavier, at-risk groups after a high-fat meal ( P < 0.05). The percentage of fat in the meals was inversely associated with the magnitude of postprandial changes in FMD at 3 hours (P < 0.01).
Conclusions
A single, high-fat meal adversely impacts endothelial function, with the magnitude of the impact on postprandial FMD moderated by the fasting FMD, participant age, BMI, and fat content of the meal. Recommendations are made to standardize the design of future postprandial FMD studies and optimize interpretation of results, as high-fat meals are commonly used in clinical studies as a challenge to assess endothelial function and therapeutics. This trial was registered at PROSPERO as CRD42020187244.
Keywords: dietary fats, vascular endothelium, cardiovascular risk, flow-mediated dilation, postprandial
Introduction
Cardiovascular disease (CVD) is the leading cause of death, accounting for more than 33% of all potential years of life lost (1). Impaired function of the endothelium, due to suboptimal NO production, appears to be the first step towards atherosclerosis and CVD (2). As NO measurement is technically challenging (3), flow-mediated dilation (FMD) is the gold-standard noninvasive technique to assess endothelial function and estimate NO bioavailability (4–6). Furthermore, the well-established and strong association between FMD measured after an overnight fast (fasting FMD) and cardiovascular risks indicates that a NO-dependent, fasting FMD measurement is a viable prognostic tool for CVD events (5, 7).
NO is an anti-inflammatory and antiatherogenic essential vasodilator (8), and its production and effectiveness are modulated by health status, age, sex, and diet (9). The typical Western-style diet is characterized by the frequent consumption of highly processed, energy-dense, nutrient-poor meals with a high-fat content (10). Poor diet constitutes a major, preventable risk factor for CVD development (11), partially through its impacts on NO and endothelial health (12). A previous systematic review on meal ingestion that focused solely on the carbohydrate amount (not fat or protein) in the unadjusted linear regression analysis indicated significant decreases in endothelial function, as measured by FMD, and this effect was moderated by participant characteristics such as age, sex, and health status (13). However, only the largest postprandial FMD change at a given time point, compared to fasting FMD measurements for each study, was recorded, excluding all other postprandial time points. The ability to respond to a meal and the timing of the response can potentially be a more sensitive CVD risk marker.
In developed countries, adults regularly consume multiple meals and snacks, spending most of their day in the postprandial state with very little time in the fasting state (14, 15). There is evidence that the postprandial metabolism of excess fat is an important initiator in the development and progression of atherosclerotic CVD (16–18). Furthermore, postprandial triglyceride concentrations have been shown to predict CVD risks better than fasting concentrations (19). Elevated postprandial concentrations of triglyceride and lipoprotein remnants after a high-fat meal are a known risk factor for CVD (20) and contribute to endothelial dysfunction, though several possible mechanisms of action exist (18). One proposed mechanism is that an increase in fatty acid oxidation in the endothelium leads to local oxidative stress and, consequently, a reduction in NO bioavailability, resulting in endothelial dysfunction (21–23).
The effect of an acute, high-fat meal on endothelial dysfunction, measured via FMD, has been widely investigated and reported in the literature since 1997 (24). However, although there is endothelial dysfunction after a high-fat meal, the magnitude of the effect and the factors that affect the response are unquantified. This information is essential for both the interpretation of data in cardiovascular studies and the design of future studies on endothelial dysfunction. Therefore, the aim of this systematic review and meta-analysis was to assess the literature and quantify the effects of a high-fat meal on endothelial function, measured by FMD. The secondary aim was to determine the factors that cause variability in the endothelial response.
Methods
Study registration
This systematic review was conducted according to the Preferred Reporting Items for Systematic Review and Meta-Analyses guidelines (25) and was registered prospectively on PROSPERO, a systematic literature review registration website, as CRD42020187244.
Search strategy
Six databases—MEDLINE in Ovid (Ovid MEDLINE In-Process and Other Non-Indexed Citations, Ovid MEDLINE Daily, and Ovid MEDLINE, from 1946), Embase (from 1947), the Cochrane Central Register of Controlled Trials (CENTRAL), Scopus (from 1788), the Cumulative Index to Nursing and Allied Health Literature (from 1961), and Web of Science Core Collection (from 1900)—were searched with no restrictions from database inception to 20 January 2022. The search strategy was developed around 3 predefined search term groups—“high fat,” “postprandial,” and “flow-mediated dilation”—to identify studies that measured the effects of a single, high-fat meal on postprandial endothelial function, as measured by FMD. These concept groups were then used as building blocks for mapping all possible keywords. An example of the full search strategy is provided in Supplemental Table 1.
Study selection and eligibility criteria
All resultant references were imported into Covidence Systematic Review Software (Veritas Health Innovation) for eligibility screening. Three authors (JJF, ALD, and GW) conducted title and abstract screening followed by full-text screening, with each article requiring assessment by 2 independent researchers for inclusion. One author (JJF) screened all studies at both the title and abstract stage (first pass) and full-text stage (second pass). All disagreements were resolved by group discussion until consensus was reached.
Studies were included if they met the following criteria: 1) were published in English; 2) studied adults aged ≥18 with no restrictions on health status; 3) provided a high-fat meal challenge that contained more than 30 g of total fat or >40% of energy from total fat for meals under 2500 kJ; and 4) reported acute postprandial endothelial function using brachial artery FMD by ultrasound up to 8 hours after the meal. Studies were excluded if: 1) the challenge meal contained less than 30 g of total fat or below 40% of energy from fat for meals under 2500 kJ; 2) FMD was not used to measure endothelial function; or 3) meals were given with supplements, drugs, or extracts without a control group receiving only a high-fat meal.
Data extraction
A single author (JJF) piloted and completed data extraction, with verification by a second author (SFC). The extracted data included study characteristics (author, year of publication, journal details, country, study design, sample size), participant characteristics (age, sex, BMI, health status), meal characteristics (food type, macronutrient energy composition), measurement protocols for FMD (time of day, placement of cuff and method of measurement), and the means and SDs of FMD at fasting and at postprandial time points. Postprandial FMD responses were extracted from all eligible studies at all time points up to 8 hours after the meal. For the purpose of the meta-analysis, participant groups within the studies were separated. For example, a study that recruited a healthy control group and a group at risk of CVD was considered as 2 separate groups. Additionally, a study that used the same population but evaluated the effects of different meals was considered 2 separate groups. Unless otherwise indicated, if the study only reported that participants arrived fasted, it was assumed that testing was performed in the morning. Where studies only reported fasting and postprandial FMD data in graphical form, data were extracted using WebPlotDigitizer, version 4.3.0 (https://automeris.io/WebPlotDigitizer/), a freely available, validated, Web‐based software program (26). The calculation of the SD was conducted according to the Cochrane handbook guidelines, section 6.5.2.8, and previous literature (27, 28). The SD of the mean difference (MD) in the FMD change from fasting was calculated using the following formula:
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(1) |
We assumed a correlation coefficient (R) of 0.5. If values were missing, the corresponding author was contacted by email, and data were requested. If the author did not respond or values were supplied as the SEMs, medians (IQRs), or 95% CIs, missing values were calculated, converted, or estimated, if possible, using published methods (29, 30) or the Cochrane handbook guidelines, section 6.5.2.2 (27).
Risk-of-bias assessment
Included studies involving randomized controlled clinical trials (RCT) were independently assessed by 2 separate authors (JJF and SFC) for risk of bias using the Cochrane Risk-of-Bias 2.0 tool for randomized trials (31, 32). This tool evaluates potential biases within studies based on a set of 5 domains, including random sequence generation and allocation concealment, blinding of participants and outcome assessors, blinding of the outcome assessment, incomplete outcome data, and selective reporting. Each RCT was classified as having either a low risk, some concerns, or a high risk of bias. Non-RCT studies were individually assessed by 2 separate authors (NJK and SFC) for risk of bias using the Risk Of Bias In Nonrandomized Studies of Interventions tool (33, 34). This tool identifies potential biases within studies based on a set of 7 domains, including confounding, selection of participants, classification of intervention, deviation from interventions, missing outcome data, measurement of outcomes, and selection of reported result. Each non-RCT study was classified as having either no information on the risk of bias or having a low risk, moderate risk, serious risk, or critical risk of bias. Inconsistencies between the reviewers’ risk-of-bias assessments at the study level were resolved through discussion until consensus was reached.
Publication bias
Publication bias was assessed by calculation of Egger's regression asymmetry test (35), with a P value ≤ 0.05 considered evidence of small-study effects. Funnel plots were constructed and visually assessed for funnel plot asymmetry.
Statistical analysis
Effects on endothelial function, measured via FMD, were expressed as MDs with 95% CIs. For studies with multiple intervention arms or participant cohorts, each arm or cohort was treated as a separate group for analysis. The change in FMD, defined as the difference between the fasting FMD and the FMD at either 2, 3, or 4 hours after consumption, was subjected to a random-effects restricted maximum likelihood model meta-analysis using Stata, version 17.0 (StataCorp), with the meta, meta regress, and meta bias functions. A meta-analysis was also conducted on the baseline (fasting) FMD, as previous research has shown that the baseline risk can affect postprandial FMD changes (13). Data were evaluated for interstudy heterogeneity using the Cochrane Q statistic and quantified by the I2 statistic with a P value ≤ 0.05. An I2 value >50% was considered substantial heterogeneity. The 95% CI of I2 was calculated using the heterogi command in Stata. A sensitivity analysis was conducted on studies with extreme results, where each study was removed individually and together. Where unexplained interstudy heterogeneity was identified, either a random-effects meta-regression analysis was undertaken or a subgroup analysis was performed. The predefined variables of age, BMI, and fasting FMD were tested for associations with the postprandial FMD via unadjusted linear regression. The variables of total energy, total fat, total carbohydrate, total protein, sample size, percentage of male participants, and year of publication were added to the unadjusted linear regression to quantify the relationship between each variable and the postprandial FMD response from fasting. Statistically significant and biologically relevant variables were included in a multivariable meta-regression model. Two-tailed P values ≤ 0.05 were considered statistically significant. All variables were tested for collinearity via the vif command in Stata. The final multivariable meta-regression model was selected following inspection of the adjusted R2 values, where the model with the largest adjusted R2 value was chosen. Subgroup analyses were conducted based on physiological, theoretical, and empirical associations with FMD (13). In brief, an unadjusted, subgroup-analysis, random-effects model was used to determine whether the relations of differing categorical study ranges of age, BMI, fasting FMD percentage change (FMD%), total fat (percentage of total energy), different study designs (RCT compared with non-RCT), different levels of CVD risk (healthy compared with cardiometabolic disease risk), risk of bias (low risk, some concerns, or high risk), sex (male, female, or mixed population) and FMD analysis method (manual detection compared with edge-detection software) had different associations to each of the FMD% outcome measures (during fasting and 2, 3, and 4 hours after eating).
Results
Study selection
A total of 10,132 articles were identified through database searching (Figure 1), with 3500 articles remaining after duplicates were removed. These articles underwent title and abstract screening, with 3244 articles excluded. A full-text screen of the remaining 256 articles resulted in 125 being excluded. Thus, 131 studies were included in the systematic review; 90 of which were considered suitable, based on the information below, for inclusion in the meta-analysis.
FIGURE 1.
Flow diagram showing the progression through the literature search and screening process. Abbreviation: FMD, flow-mediated dilation.
Initial evaluation of all 131 identified studies
The FMD technique assesses the vasodilatory response to increased blood flow after inflating a blood pressure cuff around a muscular artery for an approximate 4- to 5-minute period. The brachial artery diameter is measured, via high-resolution ultrasound, before and after the cuff inflation. The response to FMD is commonly measured as the relative percentage change in peak reactive hyperemia diameter from baseline (FMD%). Thus, to quantify the effect of a high-fat meal on endothelial function, the MD in the FMD percentage change was calculated as the fasting FMD% subtracted from the postprandial FMD%, termed the FMD change, which is measured in units of percentage points (pp). After a high-fat meal, the measured FMD change was evaluated as a mean value from all studies (Figure 2).
FIGURE 2.

A summary of the average mean difference of FMD% between postprandial and fasting measurements (postprandial FMD% − fasting FMD%) after a high–fat meal (mean ± SEM), across (A) all studies and (B) NO-dependent FMD studies. The sample size is indicated above or below the bar. ^Time points at which a meta-regression analysis was performed. Abbreviations: FMD%, flow-mediated dilation percentage change; NO, nitric oxide.
One goal of this work was to assess NO-dependent changes in vasodilation and, based on current FMD protocol guidelines, relative to the ultrasound probe on the brachial artery, distal occlusion cuff placement (i.e., on the forearm) is recommended due to limitations in proximal cuff placement (6). Furthermore, FMD is only ∼30% NO-dependent when the occlusion cuff is placed proximal to the ultrasound probe, compared to ∼70% NO-mediated during distal cuff placement (36). Guidelines also state that testing times should also be standardized to avoid diurnal variations in blood flow and pressure (37). Therefore, studies that deviated from these methods (i.e., did not assess FMD in the morning after an overnight fast or used an occlusion cuff on the upper arm) were excluded from the meta-analysis.
To mitigate the unit-of-analysis error from repeated observations on participants, 3 different outcomes, based on different periods of time, were defined and used for separate analyses as recommended by the Cochrane handbook guidelines, section 6.2.4 (27). The mean value of FMD change was calculated for each postprandial hourly time point up to 8 hours. A review of the means demonstrated a postprandial reduction in FMD%, followed by an increase back to baseline 8 hours after mean consumption (Figure 2). The FMD changes at the postprandial time points of 2, 3, and 4 hours were selected for inclusion in the meta-analyses based on an inspection of the graphical data in Figure 2.
Characteristics of studies in all 131 publications
Table 1 summarizes the characteristics of the 131 studies that were included in the systematic review. The ages of the total 4061 participants ranged from 20 to 68.4 years, with an average age of 41.0 years. The median participant BMI was 25.8 kg/m2 (IQR, 23.6–28.9 kg/m2; range, 20.5–45.1 kg/m2). The majority of the studies recruited male and female participants (n = 73), compared with 47 studies conducted only in males, 7 only recruiting females, and 4 that did not present participant sex information. Seventy-six studies recruited participants who were apparently healthy or healthy and overweight, encompassing 1838 individuals. The 2223 participants from 74 studies exhibited a range of cardiometabolic risk factors or disease profiles. These cardiometabolic at-risk populations included individuals who presented with at least 1 CVD risk factor (n = 69 studies; 2062 participants) or had been diagnosed with coronary artery disease (n = 5 studies; 161 participants).
TABLE 1.
Characteristics of the studies included in the systematic review1
| Authors, year | Country | Study design | Cuff placement | FMD timing | FMD analysis method | Risk of bias | N | Male, % | Age, y | BMI, kg/m2 | Health status | Main component of high-fat meal | Total energy, kJ | Total fat, En% | Fasting FMD, % |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Abubakar et al., 20192 (38) | UK | RCT | Forearm | Morning | Edge detection | Low | 22 | 100.0 | 49.0 ± 2.0 | 26.9 ± 0.7 | CVD risk | Croissant | 3210.0 | 57.8 | 3.7 ± 0.3 |
| Alqurashi et al., 20162 (39) | UK | RCT | Forearm | Morning | Edge detection | Low |
23 23 |
100.0 100.0 |
46.0 ± 1.9 46.0 ± 1.9 |
27.6 ± 0.4 27.6 ± 0.4 |
Healthy overweight Healthy overweight |
NR NR |
3269.0 3265.6 |
67.9 66.3 |
5.0 ± 0.5 5.7 ± 0.5 |
| Anderson et al, 20012 (40) | UK | Non-RCT | Forearm | Morning | Edge detection | Moderate |
12 12 |
58.3 41.7 |
47.3 ± 1.6 43.0 ± 2.9 |
32.2 ± 1.2 27.5 ± 0.9 |
Diabetes Healthy |
Cream Cream |
5698.6 5698.6 |
84.4 84.4 |
2.7 ± 0.3 6.3 ± 0.4 |
| Anderson et al., 20052 (41) | UK | Non-RCT | Forearm | Morning | Edge detection | Serious | 27 | 66.7 | 47.6 ± 2.3 | 29.6 ± 1.0 | Diabetes | Cream | 5698.6 | 84.4 | NR |
| Anderson et al., 20063 (42) | UK | RCT | Forearm | Morning | Edge detection | Some concerns |
10 10 |
80.0 80.0 |
53.6 ± 2.5 53.6 ± 2.5 |
28.6 ± 1.7 28.6 ± 1.7 |
Diabetes Diabetes |
Cream Cream |
5698.6 5698.6 |
84.4 84.4 |
0.4 ± 0.4 1.3 ± 0.4 |
| Ayer et al., 20102 (43) | Australia | Non-RCT | Forearm | Morning | Manual measurement | Moderate |
11 11 |
63.6 63.6 |
32.1 ± 1.9 31.6 ± 1.6 |
45.1 ± 4.7 22.8 ± 0.6 |
Obese Healthy |
Carrot cake and milkshake Carrot cake and milkshake |
4184.0 4184.0 |
53.1 53.1 |
6.2 ± 0.5 4.7 ± 1.2 |
| Bae et al., 20012 (44) | South Korea | Non-RCT | Forearm | Morning | Manual measurement | Serious | 11 | 36.4 | 56.0 ± 1.8 | NR | Healthy | Korean barbecue | 3359.8 | 58.8 | 13.7 ± 1.0 |
| Bae et al., 20012 (45) | South Korea | Non-RCT | Forearm | Morning | Manual measurement | Serious | 9 | 66.7 | 59.0 ± 3.7 | NR | CVD | Korean barbecue | 3359.8 | 58.8 | 9.2 ± 1.0 |
| Bae et al., 20032 (46) | South Korea | RCT | Forearm | Morning | Manual measurement | Some concerns | 10 | 100.0 | 26.0 ± 0.3 | NR | Healthy | Korean barbecue | 3359.8 | 58.8 | 13.30 ± 1.10 |
| Ballard et al., 20084 (47) | USA | Non-RCT | Upper arm | Morning | Edge detection | Moderate |
10 10 |
100.0 100.0 |
20.8 ± 0.6 20.9 ± 0.7 |
20.5 ± 0.4 23.4 ± 1.0 |
Healthy Healthy |
Fast food breakfast Fast food breakfast |
4393.2 4393.2 |
55.6 55.6 |
11.2 ± 0.8 9.7 ± 0.8 |
| Benson et al., 20182 (48) | USA | Non-RCT | Forearm | Morning | Edge detection | Moderate | 10 | 100.0 | 26.0 ± 1.0 | 24.7 ± 1.2 | Healthy | Milkshake | 3882.8 | 76.2 | 6.8 ± 1.0 |
| Berry et al., 20082 (49) | UK | RCT | Forearm | Morning | Edge detection | Some concerns |
17 17 |
100.0 100.0 |
27.1 ± 1.3 27.1 ± 1.3 |
24.3 ± 0.7 24.3 ± 0.7 |
Healthy Healthy |
2 muffins and a milkshake 2 muffins and a milkshake |
3570.0 3570.0 |
51.8 51.8 |
7.3 ± 0.4 7.3 ± 0.4 |
| Borucki et al., 20094 (50) | Germany | RCT | Upper arm | Morning | Manual measurement | High | 15 | 53.3 | 25.7 ± 0.4 | 22.3 ± 0.5 | Healthy | Cream | 2816.1 | 92.0 | 8.0 ± 0.7 |
| Brook et al., 20012 (51) | USA | Non-RCT | Forearm | Morning | Manual measurement | Serious | 32 | 43.8 | 34.6 ± 1.7 | 33.9 ± 1.0 | Obese | Fast food burger combo meal w/milkshake | 6819.9 | 38.5 | 6.3 ± 1.0 |
| Burton-Freeman et al., 20125 (52) | USA | RCT | Forearm | Morning | Manual measurement | Some concerns |
25 25 |
52.0 52.0 |
27.0 ± 1.6 27.0 ± 1.6 |
22.0 ± 0.4 22.0 ± 0.4 |
Healthy Healthy |
Bagel w/cream cheese Bagel w/cream cheese |
3562.7 3547.2 |
45.0 45.4 |
13.80 ± 1.30 14.50 ± 1.30 |
| Ceriello et al., 20022 (53) | Italy | RCT | Forearm | Morning | Manual measurement | Some concerns |
30 20 |
73.3 60.0 |
54.3 ± 2.6 53.5 ± 2.5 |
29.7 ± 2.3 28.4 ± 2.1 |
Diabetes Healthy |
Cream Cream |
6150.5 6150.5 |
94.8 94.8 |
4.5 ± 0.3 13.2 ± 0.9 |
| Chaves et al., 20094 (54) | USA | Non-RCT | Upper arm | Morning | Manual measurement | Serious | 5 | 100.0 | 24.0 ± NR | NR | Healthy | Fast food breakfast | 3765.6 | 48.2 | NR |
| Cho et al., 20202 (55) | South Korea | RCT | Forearm | Morning | Edge detection | Some concerns | 12 | 58.3 | 23.5 ± 0.8 | 23.4 ± 0.8 | Healthy | Fast food breakfast w/milkshake | 5573.1 | 47.1 | 9.7 ± 0.8 |
| Cortés et al., 20066 (56) | Spain | RCT | Forearm | Afternoon | Manual measurement | Some concerns |
12 12 12 12 |
75.0 75.0 91.7 91.7 |
32.0 ± 2.3 32.0 ± 2.3 45.0 ± 3.8 45.0 ± 3.8 |
24.7 ± 0.9 24.7 ± 0.9 26.3 ± 1.0 26.3 ± 1.0 |
Healthy Healthy CVD risk CVD risk |
Sandwich w/salami, cheese Sandwich w/salami, cheese Sandwich w/salami, cheese Sandwich w/salami, cheese |
5020.8 5020.8 5020.8 5020.8 |
63.0 63.0 63.0 63.0 |
4.7 ± 0.4 4.2 ± 0.4 3.6 ± 0.4 4.1 ± 0.6 |
| Curtis et al., 20222 (57) | UK | RCT | Forearm | Morning | Edge detection | Some concerns | 22 | 59.1 | 63.2 ± 1.9 | 31.5 ± 0.6 | Metabolic syndrome | Milkshake | 4054.3 | 58.9 | 2.1 ± 0.3 |
| Das et al., 20182 (58) | USA | RCT | Forearm | Morning | Edge detection | Some concerns |
11 12 13 9 |
36.4 41.7 69.2 44.4 |
27.0 ± 2.0 27.0 ± 1.0 26.0 ± 1.0 26.0 ± 1.0 |
27.0 ± 1.0 22.0 ± 0.4 24.0 ± 1.0 24.0 ± 1.0 |
Healthy Healthy Healthy Healthy |
Milkshake Milkshake Milkshake Milkshake |
3807.4 3807.4 3807.4 3807.4 |
48.6 48.6 48.6 48.6 |
9.3 ± 0.9 6.7 ± 0.7 7.5 ± 0.6 7.3 ± 0.8 |
| de Roos et al., 20022 (59) | Netherlands | RCT | Forearm | Morning | Edge detection | High |
25 25 |
100.0 100.0 |
NR NR |
25.4 ± 0.5 25.4 ± 0.5 |
Healthy Healthy |
Bread w/spread and milkshake Bread w/spread and milkshake |
4947.0 4947.0 |
59.1 59.1 |
2.3 ± 0.4 2.7 ± 0.5 |
| Deveaux et al., 20162 (60) | France | RCT | Forearm | Morning | Edge detection | High | 33 | 72.7 | 45.0 ± 1.6 | 28.0 ± 0.3 | CVD risk | Cream | 3765.6 | 80.0 | 6.4 ± 0.4 |
| Djoussé et al., 19992 (61) | USA | Non-RCT | Forearm | Morning | Edge detection | Serious |
13 13 |
53.9 53.9 |
32.0 ± 2.5 32.0 ± 2.5 |
24.9 ± 0.7 24.9 ± 0.7 |
Healthy Healthy |
Fast food burger combo meal w/Coca-Cola Fast food burger combo meal w/red wine |
5020.8 5020.8 |
47.2 47.2 |
9.5 ± 1.4 8.0 ± 1.1 |
| do Rosario et al., 20212 (62) | Australia | RCT | Forearm | Morning | Edge detection | Some concerns |
16 16 |
18.8 18.8 |
65.9 ± 1.5 65.9 ± 1.5 |
30.6 ± 1.0 30.6 ± 1.0 |
Obese Obese |
Egg, sausage, pastry breakfast w/plum juice Egg, sausage, pastry breakfast w/apricot juice |
3995.3 3986.9 |
60.5 60.6 |
4.1 ± 0.2 3.6 ± 0.3 |
| Esser et al., 20132 (63) | Netherlands | RCT | Forearm | Morning | Edge detection | Some concerns | 20 | 100.0 | 22.0 ± 0.5 | 22.7 ± 0.5 | Healthy | Cream | 3992.0 | 88.1 | 5.1 ± 0.5 |
| Evans et al., 20002 (64) | UK | RCT | Forearm | Morning | Edge detection | Some concerns |
10 8 |
50.0 50.0 |
48.7 ± 1.4 49.6 ± 2.3 |
31.3 ± 2.1 31.0 ± 2.2 |
Diabetes Diabetes |
Cream Cream |
5698.6 5698.6 |
84.4 84.4 |
3.3 ± 0.2 3.8 ± 0.2 |
| Evans et al., 20032 (65) | UK | Non-RCT | Forearm | Morning | Edge detection | Moderate | 10 | 90.0 | 53.6 ± 2.5 | 28.6 ± 1.7 | Diabetes | Cream | 5698.6 | 84.4 | 1.10 ± 0.38 |
| Fahs et al., 20106 (66) | USA | RCT | Forearm | Afternoon | Edge detection | Some concerns | 20 | 50.0 | 25.0 ± 1.0 | 23.4 ± 0.2 | Healthy | Fast food burger combo meal | 4294.9 | 45.23 | 8.4 ± 0.5 |
| Fard et al., 20002 (67) | USA | Non-RCT | Forearm | Morning | Edge detection | Serious | 50 | 68.0 | 61.8 ± 1.3 | 30.1 ± 0.6 | Diabetes | Cream | 5292.8 | 73.0 | 6.9 ± 0.6 |
| Fitschen et al., 20116 (68) | USA | Non-RCT | Forearm | Afternoon | Manual measurement | Moderate |
6 6 |
NR NR |
48.2 ± 2.0 48.2 ± 2.0 |
33.1 ± 2.7 33.1 ± 2.7 |
CVD risk CVD risk |
Sandwich w/salami, cheese Sandwich w/salami, cheese |
5020.8 5020.8 |
63.0 63.0 |
13.50 ± 3.20 9.8 ± 2.1 |
| Gaenzer et al., 20012 (69) | Austria | Non-RCT | Forearm | Morning | Manual measurement | Serious | 17 | 100.0 | 35.7 ± 1.1 | 24.1 ± 0.4 | Healthy | Cream | 5803.2 | 78.8 | 2.3 ± 0.5 |
| Gokce et al., 20014 (70) | USA | RCT | Upper arm | Morning | Edge detection | High | 14 | 57.1 | 30.0 ± 2.4 | NR | Healthy | Eggs and bacon | 4464.3 | 46.4 | 14.7 ± 2.2 |
| Grassi et al., 20162 (71) | Italy | RCT | Forearm | Morning | Edge detection | Some concerns | 19 | 36.8 | 51.3 ± 1.9 | 27.1 ± 0.3 | CVD risk | Cream | 3347.2 | 79.1 | 5.2 ± 0.2 |
| Harris et al., 20122 (72) | USA | Non-RCT | Forearm | Morning | Edge detection | Serious |
10 15 15 15 |
100.0 0.0 0.0 0.0 |
23.0 ± 0.9 20.0 ± 0.5 20.0 ± 0.5 20.0 ± 0.5 |
23.0 ± 1.0 24.0 ± 1.0 24.0 ± 1.0 24.0 ± 1.0 |
Healthy Healthy Healthy Healthy |
Fast food breakfast Fast food breakfast Fast food breakfast Fast food breakfast |
3933.0 3933.0 3933.0 3933.0 |
45.2 45.2 45.2 45.2 |
6.4 ± 1.00 12.9 ± 1.1 12.6 ± 2.0 11.0 ± 1.4 |
| Hilpert et al., 20072 (73) | USA | RCT | Forearm | Morning | Edge detection | Some concerns | 15 | 66.7 | 53.6 ± 1.9 | 28.9 ± 1.0 | Diabetes | Milkshake | 2615.0 | 70.8 | 5.2 ± 0.5 |
| Hodgson et al., 20052 (74) | Australia | RCT | Forearm | Morning | Edge detection | Some concerns |
20 20 |
NR NR |
62.1 ± 1.4 62.1 ± 1.3 |
28.1 ± 0.8 28.1 ± 0.8 |
CVD CVD |
Fast food breakfast Fast food breakfast w/cup of tea |
3400.0 3400.0 |
54.4 54.4 |
5.3 ± 0.7 4.9 ± 0.9 |
| Jahn et al., 20162 (75) | USA | Non-RCT | Forearm | Morning | Edge detection | Serious |
16 18 |
37.5 50.0 |
43.0 ± 3.0 46.0 ± 3.0 |
23.0 ± 0.5 35.0 ± 2.0 |
Healthy Metabolic syndrome |
NR NR |
2489.5 3556.4 |
60.0 60.0 |
7.3 ± 1.1 6.0 ± 1.5 |
| Johnson et al., 20112 (76) | USA | Non-RCT | Forearm | Morning | Edge detection | Moderate |
7 7 |
57.1 57.1 |
27.7 ± 2.1 27.3 ± 3.5 |
22.0 ± 3.1 22.5 ± 1.2 |
Healthy Healthy |
Fast food breakfast Fast food breakfast |
3933.0 3933.0 |
45.2 45.2 |
9.1 ± 1.5 7.9 ± 1.4 |
| Joris and Mensink, 20132 (77) | Netherlands | RCT | Forearm | Morning | Edge detection | Some concerns |
20 20 |
100.0 100.0 |
61.0 ± 1.6 61.0 ± 1.6 |
30.1 ± 0.4 30.1 ± 0.4 |
Obese Obese |
2 muffins 2 muffins w/140 mL beetroot juice |
4695.0 4695.0 |
44.6 44.6 |
4.2 ± 0.6 3.8 ± 0.7 |
| Joris et al., 20202 (78) | Netherlands | RCT | Forearm | Morning | Edge detection | Some concerns |
19 22 |
69.0 66.7 |
60.0 ± 1.8 60.0 ± 1.5 |
28.3 ± 0.4 28.6 ± 2.7 |
CVD risk CVD risk |
2 muffins w/300 mL low-fat milk 2 muffins w/300 mL low-fat milk |
4598.0 4598.0 |
45.6 45.6 |
4.5 ± 0.8 3.4 ± 0.6 |
| Joris et al., 20202 (79) | Netherlands | RCT | Forearm | Morning | Edge detection | Some concerns |
24 23 |
100.0 100.0 |
46.8 ± 5.9 52.8 ± 2.6 |
23.3 ± 0.4 29.9 ± 0.5 |
Healthy Obese |
2 muffins w/300 mL low-fat milk 2 muffins w/300 mL low-fat milk |
4598.0 4598.0 |
45.6 45.6 |
2.5 ± 0.4 3.5 ± 0.5 |
| Karatzi et al., 20082 (80) | Greece | RCT | Forearm | Morning | Manual measurement | Some concerns |
15 15 15 15 |
46.7 46.7 46.7 46.7 |
29.5 ± 1.5 29.5 ± 1.5 29.5 ± 1.5 29.5 ± 1.5 |
23.0 ± 0.7 23.0 ± 0.7 23.0 ± 0.7 23.0 ± 0.7 |
Healthy Healthy Healthy Healthy |
Vegetable soup w/olive oil and red wine Vegetable soup w/olive oil and white wine Vegetable soup w/green olive oil and red wine Vegetable soup w/green olive oil and white wine |
3079.4 3079.4 3079.4 3079.4 |
64.1 64.1 64.1 64.1 |
6.6 ± 0.8 7.2 ± 0.7 5.9 ± 0.6 7.5 ± 1.1 |
| Karatzi et al., 20132 (81) | Greece | Non-RCT | Forearm | Morning | Manual measurement | Moderate |
14 6 6 |
100.0 100.0 100.0 |
52.7 ± 2.8 52.7 ± 4.3 52.7 ± 4.3 |
27.7 ± 0.6 28.5 ± 1.2 28.5 ± 1.2 |
CVD risk CVD risk CVD risk |
Vegetable soup w/sesame oil Vegetable soup w/corn oil Vegetable soup w/olive oil |
2163.1 2163.1 2163.1 |
65.6 65.6 65.6 |
3.4 ± 0.4 4.2 ± 0.5 3.9 ± 0.3 |
| Katz et al., 20013 (82) | USA | RCT | Forearm | Morning | Manual measurement | Some concerns |
50 50 |
50.0 50.0 |
56.7 ± 1.5 56.7 ± 1.5 |
28.4 ± 1.2 28.4 ± 1.2 |
Healthy overweight Healthy overweight |
Oatmeal and a milkshake Rolled oats and a milkshake |
3424.8 3401.8 |
68.3 69.1 |
0.6 ± NR 1.1 ± NR |
| Koemel et al., 20202 (83) | USA | Non-RCT | Forearm | Morning | Edge detection | Serious |
9 8 8 7 |
55.6 62.5 50.0 28.6 |
22.1 ± 0.5 22.6 ± 1.3 68.4 ± 2.7 67.7 ± 2.7 |
23.8 ± 0.9 25.7 ± 1.3 28.2 ± 1.2 30.4 ± 1.9 |
Healthy Healthy overweight Healthy overweight Obese |
Chocolate pie Chocolate pie Chocolate pie Chocolate pie |
3513.7 3783.2 4007.4 4334.6 |
63.0 63.0 63.0 63.0 |
6.4 ± 0.6 4.0 ± 0.6 4.8 ± 0.5 3.3 ± 0.5 |
| Krüger et al., 20162 (84) | Brazil | RCT | Forearm | Morning | Manual measurement | Some concerns | 11 | 100.0 | 23.0 ± 0.9 | 23.3 ± 0.7 | Healthy | Bread w/cream and cheese | 3877.6 | 50.0 | 3.4 ± 0.5 |
| Kumar et al., 20217 (85) | India | Non-RCT | Forearm | Morning | Manual measurement | Moderate |
13 13 |
50.0 50.0 |
53.4 ± 2.5 53.4 ± 2.5 |
23.3 ± 0.7 23.3 ± 0.7 |
Healthy Diabetes |
Cream Cream |
3050.1 3050.1 |
79.1 79.1 |
24.7 ± 1.5 14.2 ± 3.3 |
| Lacroix et al., 20164 (86) | Canada | RCT | Upper arm | Morning | Edge detection | High |
11 11 17 17 |
100.0 100.0 100.0 100.0 |
35.5 ± 2.1 35.5 ± 2.1 32.7 ± 2.2 32.7 ± 2.2 |
26.9 ± 0.9 26.9 ± 0.9 24.1 ± 0.6 24.1 ± 0.6 |
Healthy Healthy Healthy Healthy |
Breakfast sandwich w/hash browns Fresh salmon Breakfast sandwich w/hash browns Fresh salmon |
3589.9 3702.8 3589.9 3702.8 |
58.7 51.3 58.7 51.3 |
11.0 ± 1.1 11.0 ± 1.1 10.5 ± 0.6 10.5 ± 0.6 |
| Lane-Cordova et al., 20162 (87) | USA | RCT | Forearm | Morning | Manual measurement | Some concerns |
11 >11 |
81.8 81.8 |
47.0 ± 5.0 47.0 ± 5.0 |
25.5 ± 0.5 25.5 ± 0.5 |
Healthy Healthy |
Soup Soup |
2175.7 2175.7 |
94.9 94.9 |
3.9 ± 0.9 4.5 ± 0.9 |
| Leary et al., 20182 (88) | USA | RCT | Forearm | Morning | Manual measurement | Some concerns | 30 | 60.0 | 26.0 ± 1.0 | 31.5 ± 0.8 | Obese | NR | 5092.9 | 68.0 | 9.0 ± 0.8 |
| Lin et al., 20082 (89) | Taiwan | RCT | Forearm | Morning | Manual measurement | Some concerns | 20 | 100.0 | 22.0 ± 0.2 | 23.5 ± 0.3 | Healthy | Fast food breakfast | 3765.6 | 49.1 | 10.5 ± 0.3 |
| Liu et al., 20024 (90) | China | Non-RCT | Upper arm | Morning | Manual measurement | Moderate |
25 37 |
80.0 81.1 |
57.0 ± 1.4 57.8 ± 1.4 |
24.3 ± 0.5 24.1 ± 0.4 |
CVD risk CVD |
NR NR |
3347.2 3347.2 |
55.3 55.3 |
6.2 ± 0.2 3.6 ± 0.1 |
| Liu et al., 20172 (91) | Australia | RCT | Forearm | Morning | Edge detection | Some concerns |
15 15 |
100.0 100.0 |
26.7 ± 1.6 26.7 ± 1.6 |
31.4 ± 0.8 31.4 ± 0.8 |
Obese Obese |
Milkshake Milkshake |
5142.1 5012.4 |
64.7 66.2 |
5.9 ± 0.6 5.4 ± 0.7 |
| Maggi et al., 20044 (92) | Italy | Non-RCT | Upper arm | Morning | Manual measurement | Moderate | 15 | 100.0 | 49.3 ± 3.1 | 28.5 ± 0.8 | Healthy overweight | NR | 6089.0 | 82.0 | 16.0 ± 1.3 |
| Marchesi et al., 20004 (93) | Italy | Non-RCT | Upper arm | Morning | Manual measurement | Moderate | 10 | 100.0 | 23.0 ± 0.6 | 23.0 ± 0.6 | Healthy | Cream | 5564.7 | 82.1 | 14.5 ± 2.1 |
| Marchesi et al., 20014 (94) | Italy | Non-RCT | Upper arm | Morning | Manual measurement | Moderate | 7 | 100.0 | 23.0 ± 1.1 | 23.0 ± 0.8 | Healthy | Cream | 5564.7 | 82.1 | 9.7 ± 0.8 |
| Marchesi et al., 20024 (95) | Italy | Non-RCT | Upper arm | Morning | Manual measurement | Moderate | 7 | 100.0 | 25.0 ± 2.3 | 23.0 ± 0.8 | Healthy | White bread w/mayonnaise | 5564.7 | 70.0 | 12.3 ± 0.6 |
| Marchesi et al., 20034 (96) | Italy | Non-RCT | Upper arm | Morning | Manual measurement | Moderate | 10 | 70.0 | 45.0 ± 2.2 | 26.3 ± 0.2 | CVD risk | Cream | 5857.6 | 82.1 | 4.3 ± 0.5 |
| Marinos et al., 20152 (97) | USA | Non-RCT | Forearm | Morning | Edge detection | Moderate | 17 | 0.0 | 42.0 ± 2.7 | 38.0 ± 1.4 | Obese | Milkshake | 6736.2 | 83.0 | 6.9 ± 0.2 |
| Markey et al., 20212 (98) | UK | RCT | Forearm | Morning | Edge detection | Some concerns | 52 | 59.2 | 14.4 ± 2.0 | 25.9 ± 0.5 | CVD risk | Sandwich w/cheese and a milkshake | 4100.0 | 45.0 | 4.7 ± 0.3 |
| McGowan et al., 20164 (99) | Ireland | Non-RCT | Upper arm | Morning | Manual measurement | Serious |
44 28 21 |
36.4 35.7 42.9 |
47.3 ± 1.5 47.3 ± 1.6 43.8 ± 2.5 |
28.1 ± 0.7 28.4 ± 0.8 26.4 ± 0.9 |
Healthy overweight Hypothyroidism Hypothyroidism |
White bread w/blueberry muffin White bread w/blueberry muffin White bread w/blueberry muffin |
3933.0 3933.0 3933.0 |
33.9 33.9 33.9 |
5.8 ± 0.6 5.9 ± 0.6 4.5 ± 0.4 |
| Miyoshi et al., 20142 (100) | Japan | RCT | Forearm | Morning | Edge detection | Some concerns | 10 | 80.0 | 31.0 ± 2.2 | 23.2 ± 0.5 | Healthy | Cookie | 4931.0 | 42.8 | 10.5 ± 2.5 |
| Muggeridge et al., 20192 (101) | UK | RCT | Forearm | Morning | Edge detection | Low |
7 7 7 7 |
14.3 14.3 14.3 14.3 |
57.0 ± 1.1 57.0 ± 1.1 57.0 ± 1.1 57.0 ± 1.1 |
30.5 ± 1.9 30.5 ± 1.9 30.5 ± 1.9 30.5 ± 1.9 |
Obese Obese Obese Obese |
2 croissants w/cheese and ham 2 croissants w/cheese and ham and orange juice 2 croissants w/cheese and ham and green tea 2 croissants w/cheese and ham and red wine |
3815.8 4171.5 3815.8 4610.8 |
55.8 51.0 55.8 46.1 |
6.4 ± 1.1 6.7 ± 1.1 6.1 ± 1.4 6.8 ± 1.6 |
| Muniyappa et al., 20122 (102) | USA | Non-RCT | Forearm | Morning | Manual measurement | Serious |
18 18 |
0.0 0.0 |
35.0 ± 2.1 38.0 ± 2.8 |
31.0 ± 1.4 29.0 ± 1.4 |
Obese Healthy overweight |
Egg and cheddar omelets w/bagel and orange juice Egg and cheddar omelets w/bagel and orange juice |
NR NR |
40.0 40.0 |
8.7 ± 1.1 7.8 ± 1.0 |
| Nagashima and Endo, 20112 (103) | Japan | RCT | Forearm | Morning | Manual measurement | Some concerns | 12 | 100.0 | 39.8 ± 2.7 | 29.4 ± 0.5 | Obese | Cream | 1000.7 | 70.0 | 11.1 ± 0.7 |
| Nicholls et al., 20062 (104) | Australia | RCT | Forearm | Morning | Manual measurement | Some concerns |
14 14 |
57.1 57.1 |
29.5 ± 2.3 29.5 ± 2.3 |
23.6 ± 0.8 23.6 ± 0.8 |
Healthy Healthy |
Carrot cake and milkshake Carrot cake and milkshake |
4184.0 4184.0 |
53.1 53.1 |
5.2 ± 1.1 6.9 ± 0.9 |
| Nierman et al., 20053 (105) | Netherlands | Non-RCT | Forearm | Morning | Edge detection | Moderate |
15 15 |
100.0 100.0 |
50.1 ± 2.0 49.5 ± 2.1 |
26.4 ± 0.9 25.4 ± 0.5 |
Healthy overweight Healthy |
Cream Cream |
NR NR |
NR NR |
NR NR |
| Njike et al., 20214 (106) | USA | RCT | Forearm | Morning | Edge detection | High | 20 | 50.0 | 56.1 ± 3.2 | 31.4 ± 1.3 | CVD risk | Smoothie | NR | NR | 14.0 ± 1.3 |
| Noda et al., 20132 (107) | Japan | RCT | Forearm | Morning | Manual measurement | Some concerns | 10 | 80.0 | 35.0 ± 3.2 | 23.9 ± 1.3 | Healthy | Cookie | 4931.0 | 42.8 | 11.8 ± 0.6 |
| Norata et al., 20074 (108) | Italy | Non-RCT | Upper arm | Morning | Manual measurement | Moderate |
23 30 |
100.0 100.0 |
51.8 ± 2.3 51.7 ± 2.1 |
26.1 ± 0.7 27.5 ± 0.4 |
Healthy overweight CVD risk |
NR NR |
5799.0 5799.0 |
82.0 82.0 |
NR NR |
| Ochiai et al., 20154 (109) | Japan | RCT | Upper arm | Morning | Manual measurement | High | 13 | 100.0 | 44.9 ± 1.4 | 21.9 ± 0.6 | Healthy | 2 cookies, cheese, and soup | 2359.8 | 47.0 | 5.9 ± 1.1 |
| Ohno et al., 20142 (110) | Japan | RCT | Forearm | Morning | Manual measurement | Some concerns | 10 | 100.0 | 43.0 ± 3.2 | 28.8 ± 0.4 | Metabolic Syndrome | Cookie | 5450.1 | 42.8 | 5.9 ± 0.7 |
| Padilla et al., 20062 (111) | USA | Non-RCT | Forearm | Morning | Manual measurement | Serious | 8 | 62.5 | 25.5 ± 0.8 | 22.8 ± 0.6 | Healthy | Fast food breakfast | 3933.0 | 45.2 | 5.7 ± 1.2 |
| Papadakis et al., 20202 (112) | USA | RCT | Forearm | Morning | Edge detection | Some concerns | 15 | 100.0 | 31.1 ± 1.4 | 25.8 ± 0.7 | Healthy | Egg, sausage w/pastry and milk | 5476.9 | 59.5 | 12.6 ± 1.4 |
| Patik et al., 20182 (113) | USA | RCT | Forearm | Morning | Edge detection | Some concerns | 10 | 100.0 | 24.0 ± 1.0 | 24.3 ± 1.2 | Healthy | Fast food breakfast | 4142.2 | 49.1 | 6.6 ± 0.5 |
| Petersen et al., 20202 (114) | USA | RCT | Forearm | Morning | Edge detection | Low |
13 13 13 |
100.0 100.0 100.0 |
52.0 ± 2.5 52.0 ± 2.5 52.0 ± 2.5 |
29.9 ± 0.9 29.9 ± 0.9 29.9 ± 0.9 |
CVD risk CVD risk CVD risk |
Corn muffin w/chicken Corn muffin w/chicken and 2 g spices blend Corn muffin w/chicken and 6 g spices blend |
4502.0 4502.0 4502.0 |
49.3 49.3 49.3 |
4.9 ± 0.3 5.1 ± 0.5 5.7 ± 0.4 |
| Plotnick et al., 19974 (115) | USA | RCT | Upper arm | Morning | Manual measurement | High | 20 | 35.0 | 37.3 ± 2.0 | 23.0 ± 0.9 | Healthy | Fast food breakfast | 3765.6 | 49.1 | 20.0 ± 1.8 |
| Plotnick et al., 20034 (116) | USA | RCT | Upper arm | Morning | Manual measurement | High | 10 | NR | NR | NR | Healthy | Fast food breakfast | 3765.6 | 49.1 | 20.2 ± 1.3 |
| Poitras et al., 20142 (117) | Canada | Non-RCT | Forearm | Morning | Edge detection | Moderate | 10 | 100.0 | 23.2 ± 1.0 | 24.4 ± 0.8 | Healthy | Fast food breakfast | 4184.0 | 47.8 | 5.9 ± 0.8 |
| Raitakari et al., 20002 (118) | Australia | Non-RCT | Forearm | Morning | Manual measurement | Serious |
12 12 |
58.3 58.3 |
33.0 ± 2.0 33.0 ± 2.0 |
24.3 ± 0.9 24.3 ± 0.9 |
Healthy Healthy |
2 muffins, sausage and 2 hash browns 2 muffins, sausage and 2 hash browns |
4309.5 4309.5 |
52.4 52.4 |
4.2 ± 0.7 5.2 ± 1.1 |
| Ramírez-Vélez, 20112 (119) | Colombia | Non-RCT | Forearm | Morning | Manual measurement | Moderate | 14 | 100.0 | 21.0 ± 0.8 | 23.7 ± 1.2 | Healthy | NR | 4389.0 | 66.6 | 5.9 ± 0.3 |
| Ramírez-Vélez et al., 20182 (120) | Colombia | RCT | Forearm | Morning | Manual measurement | Low |
11 9 |
72.7 55.6 |
31.8 ± 2.4 31.4 ± 2.1 |
24.4 ± 1.3 23.5 ± 1.0 |
Healthy Healthy |
NR NR |
4389.0 4389.0 |
66.6 66.6 |
13.5 ± 1.9 8.1 ± 1.4 |
| Rathnayake et al., 20182 (121) | UK | RCT | Forearm | Morning | Edge detection | High |
32 32 32 |
0.0 0.0 0.0 |
58.0 ± 1.0 58.0 ± 1.0 58.0 ± 1.0 |
25.9 ± 0.7 25.9 ± 0.7 25.9 ± 0.7 |
Healthy overweight Healthy overweight Healthy overweight |
Warm chocolate drink w/white bread Warm chocolate drink w/white bread Warm chocolate drink w/white bread |
3800.0 3800.0 3800.0 |
52.3 51.7 51.7 |
4.7 ± 0.4 5.0 ± 0.6 4.7 ± 0.4 |
| Rendeiro et al., 20162 (122) | UK | RCT | Forearm | Morning | Edge detection | High |
28 28 28 28 |
100.0 100.0 100.0 100.0 |
48.0 ± 1.0 48.0 ± 1.0 48.0 ± 1.0 48.0 ± 1.0 |
28.4 ± 0.4 28.4 ± 0.4 28.4 ± 0.4 28.4 ± 0.4 |
Healthy overweight Healthy overweight Healthy overweight Healthy overweight |
2 croissants w/control drink 2 croissants w/orange juice 2 croissants w/flavanone-rich orange juice 2 croissants w/whole orange juice |
3251.0 3251.0 3251.0 3251.0 |
58.0 58.0 58.0 58.0 |
4.9 ± 0.3 4.8 ± 0.3 4.8 ± 0.3 4.7 ± 0.2 |
| Rouyer et al., 20192 (123) | France | RCT | Forearm | Morning | Manual measurement | High |
17 17 17 |
100.0 100.0 100.0 |
24.6 ± 0.9 24.6 ± 0.9 24.6 ± 0.9 |
23.6 ± 0.8 23.6 ± 0.8 23.6 ± 0.8 |
Healthy Healthy Healthy |
NR NR NR |
7655.0 7655.0 7655.0 |
39.2 39.2 39.2 |
9.8 ± 0.9 8.3 ± 0.7 9.0 ± 0.6 |
| Rudolph et al., 20072 (124) | Germany | RCT | Forearm | Morning | Edge detection | Some concerns |
24 24 24 |
41.7 41.7 41.7 |
32.0 ± 2.3 32.0 ± 2.3 32.0 ± 2.3 |
24.0 ± 1.0 24.0 ± 1.0 24.0 ± 1.0 |
Healthy Healthy Healthy |
Fast food burger combo meal w/soda Fast food vegetarian burger combo meal w/soda Fast food vegetarian burger w/vitamin rich sides |
5209.1 5087.7 4422.5 |
34.8 35.6 25.9 |
9.7 ± 0.5 9.2 ± 0.7 8.8 ± 0.7 |
| Rueda-Clausen et al., 20072 (125) | Colombia | RCT | Forearm | Morning | Manual measurement | Some concerns |
10 10 10 10 10 10 10 10 10 |
100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 |
20.8 ± 0.8 20.8 ± 0.8 20.8 ± 0.8 20.8 ± 0.8 20.8 ± 0.8 20.8 ± 0.8 20.8 ± 0.8 20.8 ± 0.8 20.8 ± 0.8 |
21.9 ± 0.8 21.9 ± 0.8 21.9 ± 0.8 21.9 ± 0.8 21.9 ± 0.8 21.9 ± 0.8 21.9 ± 0.8 21.9 ± 0.8 21.9 ± 0.8 |
Healthy Healthy Healthy Healthy Healthy Healthy Healthy Healthy Healthy |
250 mL soup w/potatoes 250 mL soup w/potatoes 250 mL soup w/potatoes 250 mL soup w/potatoes 250 mL soup w/potatoes 250 mL soup w/potatoes 250 mL soup w/potatoes 250 mL soup w/potatoes 250 mL soup w/potatoes |
2494.5 2494.5 2494.5 2494.5 2494.5 2494.5 2494.5 2494.5 2494.5 |
90.7 90.7 90.7 90.7 90.7 90.7 90.7 90.7 90.7 |
11.4 ± 1.0 11.6 ± 1.2 11.4 ± 0.9 11.2 ± 0.9 10.5 ± 1.0 10.7 ± 1.0 10.9 ± 1.0 11.3 ± 1.0 11.4 ± 1.0 |
| Salden et al., 20162 (126) | Netherlands | RCT | Forearm | Morning | Edge detection | High | 34 | 35.3 | 53.0 ± 2.4 | 29.7 ± 0.5 | Healthy | Milkshake | 2600.0 | 61.0 | 5.6 ± 0.5 |
| Schillaci et al., 20014 (127) | Italy | Non-RCT | Upper arm | Morning | Manual measurement | Moderate | 10 | 0.0 | 23.0 ± 0.6 | 22.0 ± 0.6 | Healthy | Cream | 4979.0 | 82.1 | 14.6 ± 1.6 |
| Sejda et al., 20022 (128) | Prague | RCT | Forearm | Morning | Manual measurement | Some concerns |
11 11 |
54.6 54.6 |
24.0 ± 1.4 24.0 ± 1.4 |
22.8 ± 0.5 22.8 ± 0.5 |
Healthy Healthy |
Cream cake, doughnut, and cocoa Cream cake, doughnut, and cocoa |
3496.0 3496.0 |
44.8 44.8 |
3.1 ± 0.9 5.3 ± 0.9 |
| Shah et al., 20172 (129) | UK | RCT | Forearm | Morning | Edge detection | Some concerns |
10 10 10 |
100.0 0.0 0.0 |
54.0 ± 1.3 51.0 ± 1.0 62.0 ± 1.6 |
27.0 ± 1.8 27.0 ± 1.8 25.3 ± 1.3 |
Healthy overweight Healthy overweight Healthy overweight |
Fast food breakfast Fast food breakfast Fast food breakfast |
3933.0 3933.0 3933.0 |
45.2 45.2 45.2 |
5.4 ± 1.2 7.1 ± 1.2 6.6 ± 1.2 |
| Shige et al., 19992 (130) | Japan | Non-RCT | Forearm | Morning | Edge detection | Serious | 7 | 71.4 | 49.3 ± 3.0 | 26.0 ± 1.9 | Diabetes | Cream | 6188.1 | 47.8 | 8.1 ± 1.0 |
| Siepi et al., 20024 (131) | Italy | Non-RCT | Upper arm | Morning | Manual measurement | Moderate | 10 | 0.0 | 57.0 ± 2.5 | NR | Healthy | Cream | 4979.0 | 82.1 | 7.7 ± 0.9 |
| Silvestre et al., 20086 (132) | USA | RCT | Forearm | Afternoon | Edge detection | Some concerns | 12 | 100.0 | 21.8 ± 2.5 | 25.1 ± 3.1 | Healthy | Cream | 4389.4 | 95.2 | 2.7 ± NR |
| Skilton et al., 20052 (133) | Australia | Non-RCT | Forearm | Morning | Manual measurement | Moderate |
15 15 15 |
60.0 60.0 60.0 |
58.0 ± 2.1 57.0 ± 2.3 33.0 ± 1.8 |
27.4 ± 1.3 26.3 ± 0.9 24.6 ± 0.9 |
Diabetes Healthy overweight Healthy overweight |
2 muffins, 2 hash browns, and a sausage 2 muffins, 2 hash browns, and a sausage 2 muffins, 2 hash browns, and a sausage |
4309.5 4309.5 4309.5 |
52.4 52.4 52.4 |
3.7 ± 0.6 3.2 ± 0.8 4.5 ± 0.9 |
| Smeets et al., 20202 (134) | Netherlands | RCT | Forearm | Morning | Edge detection | Some concerns | 18 | 100.0 | 64.2 ± 1.4 | 30.8 ± 0.8 | Obese | NR | 3987.0 | 52.3 | 5.1 ± 0.6 |
| Smeets et al., 20212 (135) | Netherlands | RCT | Forearm | Morning | Edge detection | Some concerns | 18 | 100.0 | 60.9 ± 3.1 | 30.5 ± 0.7 | Obese | NR | 3987.0 | 52.3 | 4.0 ± 0.5 |
| Smolders et al., 20195 (136) | Netherlands | RCT | Forearm | Morning | Edge detection | High | 44 | 63.6 | 60.3 ± 0.8 | 29.2 ± 0.5 | Healthy overweight | Shake, contents NR | 4037.6 | 55.5 | 4.9 ± 0.4 |
| Stirban et al., 20102 (137) | USA | RCT | Forearm | Morning | Edge detection | Some concerns | 31 | NR | 56.8 ± 1.5 | 31.2 ± 0.7 | Diabetes | Bread w/cheese and salami | 2510.4 | 59.0 | 5.5 ± 0.6 |
| Stonehouse et al., 20152 (138) | Australia | RCT | Forearm | Morning | Manual measurement | Low |
28 28 |
100.0 100.0 |
56.8 ± 1.5 56.8 ± 1.5 |
30.0 ± 0.6 30.0 ± 0.6 |
Obese Obese |
Chicken w/fried white bread and salad Chicken w/fried white bread and salad |
2791.0 2791.0 |
58.3 58.3 |
5.8 ± 0.6 5.6 ± 0.6 |
| Swift et al., 20132 (139) | USA | Non-RCT | Forearm | Morning | Edge detection | Moderate |
8 8 |
0.0 0.0 |
55.0 ± 0.6 57.6 ± 1.8 |
30.8 ± 2.2 29.3 ± 1.8 |
Obese Obese |
Egg w/sausage, cheese, orange juice, and milk Egg w/sausage, cheese, orange juice, and milk |
2301.2 2301.2 |
57.0 57.0 |
5.40 ± 1.19 4.0 ± 1.7 |
| Tsai et al., 20042 (22) | Taiwan | Non-RCT | Forearm | Morning | Manual measurement | Moderate | 16 | 100.0 | 30.0 ± 1.3 | 23.1 ± 0.6 | Healthy | Fast food breakfast | 3765.6 | 49.1 | 9.4 ± 0.2 |
| Tucker et al., 20182 (140) | USA | RCT | Forearm | Morning | Edge detection | Some concerns | 13 | 100.0 | 27.0 ± 1.0 | 25.6 ± 1.1 | Healthy | Fast food breakfast | 5230.0 | 44.6 | 5.1 ± 0.4 |
| Tushuizen et al., 20062 (141) | Netherlands | RCT | Forearm | Morning | Edge detection | Some concerns | 17 | 100.0 | 25.4 ± 0.7 | 23.6 ± 0.4 | Healthy | Fast food breakfast | 3765.6 | 49.1 | 6.8 ± 0.6 |
| Tushuizen et al., 20072 (142) | Netherlands | Non-RCT | Forearm | Morning | Edge detection | Moderate |
15 12 |
100.0 100.0 |
55.5 ± 1.0 55.5 ± 1.2 |
32.7 ± 1.1 27.2 ± 0.6 |
Diabetes Healthy overweight |
NR NR |
3765.6 3765.6 |
49.1 49.1 |
5.6 ± 0.2 8.9 ± 0.3 |
| Tyldum et al., 20092 (143) | Norway | RCT | Forearm | Morning | Edge detection | Some concerns | 8 | 100.0 | 42.0 ± 4.0 | 28.8 ± 0.9 | Healthy | Vegetarian mozzarella pizza | 3812.5 | 46.9 | 7.1 ± 0.3 |
| van der Made et al., 2017a2 (144) | Netherlands | RCT | Forearm | Morning | Edge detection | Some concerns |
43 45 |
32.6 33.3 |
62.0 ± 1.2 62.0 ± 0.9 |
26.3 ± 0.6 26.9 ± 0.5 |
CVD risk CVD risk |
2 muffins 2 muffins |
4095.0 4095.0 |
51.1 51.1 |
2.5 ± 0.3 2.6 ± 0.3 |
| van der Made et al., 2017b2 (145) | Netherlands | RCT | Forearm | Morning | Edge detection | Some concerns | 37 | 55.6 | 61.0 ± 1.0 | 28.3 ± 0.5 | Healthy overweight | 2 muffins and 300 mL skim milk | 4598.0 | 45.6 | 3.0 ± 0.3 |
| van Oostrom et al., 20037 (146) | Netherlands | RCT | Forearm | Morning | Edge detection | High | 8 | 100.0 | 23.0 ± 0.7 | 21.7 ± 0.5 | Healthy | Cream | 8325.0 | 40.0 | 13.0 ± 1.5 |
| Verwer et al., 20202 (147) | Netherlands | Non-RCT | Forearm | Morning | Edge detection | Some concerns |
12 12 12 |
100.0 100.0 100.0 |
55.3 ± 2.2 54.6 ± 1.0 57.2 ± 1.8 |
27.1 ± 0.8 32.6 ± 1.3 30.6 ± 1.0 |
Healthy Diabetes Metabolic syndrome |
Fast food breakfast Fast food breakfast Fast food breakfast |
3765.6 3765.6 3765.6 |
49.1 49.1 49.1 |
7.9 ± 0.5 4.9 ± 0.5 5.7 ± 0.7 |
| Vogel et al., 19974 (24) | USA | Non-RCT | Upper arm | Morning | Manual measurement | Serious | 10 | 50.0 | 39.0 ± 3.2 | 23.0 ± 0.6 | Healthy | Fast food breakfast | 3765.6 | 49.13 | 21.0 ± 1.6 |
| Vogel et al., 20004 (148) | USA | Non-RCT | Upper arm | Morning | Edge detection | Serious |
10 10 10 10 |
50.0 50.0 50.0 50.0 |
NR NR NR NR |
NR NR NR NR |
Healthy Healthy Healthy Healthy |
Bread w/extra-virgin olive oil Bread w/canola oil Red salmon w/cracker Bread w/extra-virgin olive oil and salad |
3765.6 3765.6 3765.6 3765.6 |
49.1 49.1 49.1 49.1 |
14.3 ± 1.3 13.0 ± 1.1 13.1 ± 1.6 13.5 ± 1.1 |
| Volek et al., 20083 (149) | USA | RCT | Forearm | Morning | Edge detection | Some concerns | 30 | 53.3 | 30.0 ± 1.5 | 24.1 ± 0.8 | Healthy | Cream w/macadamia nuts | 3799.1 | 84.0 | 6.6 ± NR |
| Volek et al., 20094 (150) | USA | RCT | Upper arm | Morning | Edge detection | High |
20 20 |
50.0 50.0 |
32.6 ± 2.5 36.9 ± 2.8 |
33.5 ± 1.2 32.1 ± 0.9 |
CVD risk CVD risk |
Cream w/macadamia nuts Cream w/macadamia nuts |
3799.1 3799.1 |
84.0 84.0 |
5.0 ± 0.7 7.1 ± 0.7 |
| West et al., 20052 (151) | USA | RCT | Forearm | Morning | Edge detection | Some concerns |
18 18 18 |
72.2 72.2 72.2 |
55.1 ± 2.1 55.1 ± 2.1 55.1 ± 2.1 |
29.2 ± 0.8 29.2 ± 0.8 29.2 ± 0.8 |
Diabetes Diabetes Diabetes |
Milkshake Milkshake Milkshake |
2615.0 2615.0 2615.0 |
70.8 70.8 70.8 |
5.1 ± 0.6 4.9 ± 0.6 5.5 ± 0.6 |
| Westerink et al., 20132 (152) | Netherlands | RCT | Forearm | Morning | Manual measurement | Some concerns | 93 | 59.0 | 57.0 ± 0.9 | 30.0 ± 0.3 | Metabolic syndrome | Cream | 9943.8 | 40.0 | 4.6 ± 0.3 |
| Westphal et al., 20064 (153) | Germany | RCT | Upper arm | Morning | Manual measurement | High | 16 | 50.0 | 21.0 ± 2.0 | 22.0 ± 1.1 | Healthy | Cream | 2759.8 | 92.0 | 8.5 ± 0.8 |
| Westphal et al., 20094 (154) | Germany | RCT | Upper arm | Morning | Manual measurement | High | 27 | 59.3 | 59.0 ± 1.5 | 35.5 ± 1.0 | Metabolic syndrome | Cream | 4023.0 | 92.0 | 5.1 ± 0.3 |
| Westphal and Luley, 20114 (155) | Germany | RCT | Upper arm | Morning | Manual measurement | High |
18 18 |
11.1 11.1 |
25.2 ± 2.5 25.2 ± 2.5 |
22.8 ± 2.0 22.8 ± 2.0 |
Healthy Healthy |
Cream Cream |
7072.9 7072.9 |
63.6 63.6 |
8.5 ± 0.6 8.8 ± 0.5 |
| Widdowson et al., 20174 (156) | Ireland | Non-RCT | Upper arm | Morning | Manual measurement | Moderate |
50 50 |
50.0 50.0 |
49.8 ± 1.1 50.7 ± 1.1 |
29.3 ± 0.9 29.8 ± 0.8 |
Overweight Overweight |
NR NR |
3933.0 3933.0 |
33.9 33.9 |
6.3 ± 0.6 4.8 ± 0.6 |
| Williams et al., 19992 (157) | New Zealand | RCT | Forearm | Morning | Manual measurement | Some concerns |
10 10 |
100.0 100.0 |
38.0 ± 1.9 38.0 ± 1.9 |
24.6 ± 0.9 24.6 ± 0.9 |
Healthy Healthy |
Milkshake Milkshake |
3754.0 3754.0 |
63.5 63.5 |
5.9 ± 0.7 5.3 ± 0.7 |
| Williams et al., 20012 (158) | New Zealand | RCT | Forearm | Morning | Manual measurement | Some concerns |
14 14 |
100.0 100.0 |
32.0 ± 2.7 32.0 ± 2.7 |
24.6 ± 0.8 24.6 ± 0.8 |
Healthy Healthy |
Milkshake Milkshake |
4274.0 4274.0 |
67.9 67.9 |
4.9 ± 0.6 5.1 ± 0.8 |
| Wilmink et al., 19992 (159) | Netherlands | RCT | Forearm | Morning | Edge detection | Some concerns | 30 | 50.0 | 23.0 ± 0.6 | 22.6 ± 0.5 | Healthy | Cream | 8325.0 | 40.0 | 6.6 ± 0.9 |
| Wilmink et al., 20002 (160) | Netherlands | RCT | Forearm | Morning | Edge detection | Some concerns | 20 | 50.0 | 23.0 ± 0.8 | 22.8 ± 0.6 | Healthy | Cream | 8325.0 | 40.0 | 10.4 ± 0.7 |
| Wilmink et al., 20012 (161) | Netherlands | RCT | Forearm | Morning | Edge detection | Some concerns | 15 | 100.0 | 25.1 ± 1.1 | 23.1 ± 0.7 | Healthy | Cream | 8787.5 | 40.0 | 9.1 ± 0.9 |
| Xiang et al., 20122 (162) | China | Non-RCT | Forearm | Morning | Manual measurement | Serious |
10 10 10 |
0.0 0.0 0.0 |
34.6 ± 1.7 34.2 ± 1.8 35.5 ± 2.1 |
23.8 ± 0.6 24.1 ± 0.7 24.3 ± 0.8 |
Healthy Hypothyroidism Hypothyroidism |
NR NR NR |
3347.2 3347.2 3347.2 |
62.0 62.0 62.0 |
5.9 ± 0.2 3.9 ± 0.2 3.3 ± 0.2 |
| Yunoki et al., 20112 (163) | Japan | RCT | Forearm | Morning | Manual measurement | Some concerns |
10 10 |
80.0 90.0 |
38.0 ± 3.2 37.0 ± 1.3 |
23.9 ± 0.9 25.3 ± 1.6 |
CVD risk CVD risk |
Cookie Cookie |
4931.0 4931.0 |
42.8 42.8 |
8.5 ± 0.8 8.5 ± 0.6 |
| Zhang et al., 20124 (164) | China | RCT | Upper arm | Morning | Manual measurement | High |
35 38 |
51.4 55.3 |
48.3 ± 1.1 48.4 ± 1.5 |
24.2 ± 0.3 25.1 ± 0.4 |
Healthy CVD risk |
NR NR |
4895.3 4895.3 |
60.0 60.0 |
14.6 ± 0.4 11.5 ± 0.4 |
| Zhao et al., 20014 (165) | China | Non-RCT | Upper arm | Morning | Manual measurement | Serious |
50 25 |
78.0 80.0 |
57.1 ± 1.0 56.1 ± 1.1 |
26.4 ± 0.7 22.6 ± 0.7 |
CVD Healthy |
NR NR |
3347.2 3347.2 |
55.3 55.3 |
3.0 ± 0.1 6.6 ± 0.1 |
| Zhao et al., 20044 (166) | China | RCT | Upper arm | Morning | Manual measurement | High | 25 | 56.0 | 59.1 ± 1.3 | 25.7 ± 0.4 | CVD | NR | 3347.2 | 55.3 | 7.8 ± 1.7 |
Edge detection involves the use of computer-automated software to track the artery diameter continuously. Values are mean ± SEM unless otherwise indicated. Each line is an independent group. The majority of the 131 studies were randomized (n = 83), with 66 crossover and 17 parallel designs. Studies were conducted in 22 countries, with the majority conducted in the United States (n = 37), the Netherlands (n = 20), the United Kingdom (n = 14), and Italy (n = 10). The median study sample size was 15 (IQR, 10–20; range, 5–93). The high-fat meals consumed were varied across the studies, with fast food (n = 22) or a cream-based (n = 32) meal being most used. Thirty-one studies supplied various pastry-based food items. Twelve studies provided milkshakes. Five studies consumed soup with various plant oils added. A further 5 studies provided dinner meals. Lastly, 6 studies supplied a breakfast meal. Information about the food provided was absent from 17 studies, with authors mostly stating an oral fat load or high-fat breakfast was consumed, without further explanation. Overall, most studies (n = 131) reported the total energy content of the meal, with a calculated average total energy of 4197 kJ. However, the extent of information on the macronutrient compositions, especially the types of fat, differed across the studies. The average amount of fat provided in the meals was 66.3 grams or 59.5% of the total meal energy content. Animal products provided the primary type of fat in most test meals, with energy being derived from egg, sausage, bacon, cream, cheese, or milk. The main plant oils used included olive, corn, palm, sesame, soybean, or safflower oil. Abbreviations: CVD, cardiovascular disease; En%, percentage of total meal energy; FMD, flow-mediated dilation; NR, not reported; RCT, randomized controlled trial; w/, with.
Denotes studies that are included in the meta-analysis.
Denotes studies that were excluded due to unreported FMD data.
Denotes studies that were excluded due to use of proximal cuff occlusion FMD protocol.
Denotes studies that were excluded due to FMD not being measured at the hourly mark.
Denotes studies that were excluded due to conducting the clinical trial in the afternoon.
Denotes studies that were excluded by the sensitivity analysis.
Sixty-three studies measured the FMD at multiple time points and 62 studies only measured the FMD at 1 time point. Of the remaining 6 studies, 4 did not report FMD results (42, 82,105, 149) and 2 only reported FMD results at fractions of the whole hour (52,136); thus, all 6 studies were dropped from the meta-analyses (Figure 1). There were 102 studies that performed FMD with the vascular cuff placed on the forearm, distal to the ultrasound probe placed on the brachial artery, compared to 29 studies that placed the cuff on the upper arm. Hence, studies where the cuff was placed proximal to the probe were excluded from the meta-analyses (Figure 1). Most interventions commenced in the morning (n = 127), in comparison to 4 studies that measured FMD in the afternoon (56,66,68,132); these 4 studies were dropped from the meta-analyses (Figure 1). There were 2 studies, Kumar et al. (85) and van Oostrom et al. (146), that had extreme results in FMD changes. As a result of the sensitivity analysis, both studies were removed from the meta-analyses (Figure 1).
Sixty-one studies measured the artery diameter periodically; this manual method of FMD analysis typically averages a small, discrete number of measurements from the precuff inflation period for calculation of the baseline artery diameter and uses only 1 measurement at 60 seconds after cuff deflation. More recent trials (n = 70) have utilized the preferred, edge-detection method for FMD analysis (6). This method can track the artery continuously and determine the diameter over the entire protocol, accurately averaging the baseline artery diameter for the entire 1-minute baseline period, as well as determine the true peak artery diameter after cuff deflation. The FMD changes were reported at 1 hour (n = 27), 2 hours (n = 111), 3 hours (n = 70), 4 hours (n = 136), 5 hours (n = 15), 6 hours (n = 44), 7 hours (n = 1), and 8 hours (n = 18) after consumption. A thorough breakdown of the characteristics of all included studies and NO-dependent-only studies can be found in Supplemental Table 2.
Characteristics of the 90 studies included in the meta-analysis and review of NO-dependent FMD
Most of the 90 studies included in the meta-analysis and review of NO-dependent FMDs were randomized (n = 62), with 49 crossover and 13 parallel designs. The median study sample size was 14 (IQR, 10–20; range, 6–93). There was a total of 2856 participants, with a mean age of 41 years (range, 20–68 years). The median BMI was 25.9 kg/m2 (IQR, 23.8–29.2 kg/m2; range, 21.9–45.1 kg/m2). The bulk of the studies recruited mixed-sex populations (n = 48), compared to 35 studies conducted only in males, 5 studies only recruiting females, and 2 studies that did not report participant sex. Eighty-seven groups were apparently healthy or healthy overweight participants, including 1258 individuals. Seventy-nine groups, encompassing 1598 participants, exhibited a spectrum of cardiometabolic risk factors or disease profiles, including diabetes, hypertension, obesity, hypertriglyceridemia, metabolic syndrome, hypothyroidism, or heart disease. These cardiometabolic at-risk populations contained individuals who presented with at least 1 CVD risk factor (n = 76 studies; 1549 participants) or had been diagnosed with coronary artery disease (n = 3 studies; 49 participants). The high-fat meals consumed included fast food meals (n = 16), cream-based meals (n = 16), pastry or bread (n = 25), a milkshake or smoothie (n = 10), or soup (n = 4). Ten studies did not report the meal contents. The mean total energy content of the meals was 4145 kJ, with an average of 64 grams or 58.5% total fat per meal. Postprandial FMD changes were measured at 1 hour (n = 20), 2 hours (n = 85), 3 hours (n = 53), 4 hours (n = 91), 5 hours (n = 11), 6 hours (n = 25), 7 hours (n = 0) and 8 hours (n = 11) after consumption. The majority of the NO-dependent FMD studies (n = 57) employed the edge-detection method for FMD analysis, whereas 33 studies measured the artery diameter periodically.
The overall outcome of the primary aim: random-effects model meta-analysis while fasting and 2, 3, and 4 hours after eating
Forest plots of postprandial FMD changes from fasting to 2, 3, and 4 hours after eating are presented in Figure 3. The mean postprandial FMD changes from fasting were −1.02 pp (95% CI: −1.34 to −0.70 pp; P < 0.01) at 2 hours, −1.04 pp (95% CI: −1.48 to −0.59 pp; P < 0.001) at 3 hours, and −1.19 pp (95% CI: −1.53 to −0.84 pp; P < 0.01) at 4 hours. The mean fasting FMD% effect size was 6.31% (95% CI: 5.89%–6.72%; P < 0.01); the forest plot for fasting FMD% values is depicted in Supplemental Figure 1. Statistical heterogeneity between studies was high at 2 hours (I2, 93.3%; 95% CI: 93%–94%), 3 hours (I2, 84.5%; 95% CI: 74%–85%), and 4 hours (I2, 94.6%; 95% CI: 90%–95%) after eating and while fasting (I2, 97.8%; 95% CI: 97%–98%).
FIGURE 3.


Forest plots of the impactof a single, high-fat meal on endothelial function at (A) 2 hours, (B) 3 hours, and (C) 4 hours after consumption. Mean FMD% differences and 95% CIs are indicated by white dots and black horizontal lines. The size of each box is proportionally scaled to the effect size for each group in the restricted maximum likelihood model. The black diamond represents the average mean difference for all groups. FMD is measured as the relative percentage change in the peak reactive hyperemia diameter from the baseline diameter (FMD%). The mean difference in the FMD% was calculated as the fasting FMD% subtracted from the postprandial FMD%, termed the FMD change; the units of the FMD change are pp. The heterogeneity analysis is also presented. *Groups with the same participants consuming different types of meals. Specific meal contents are described in Table 1. #Groups with the same participants consuming the same meal before and after different diet interventions. Abbreviations: CVD, cardiovascular disease; En%, percentage of total meal energy; FMD, flow-mediated dilation; FMD%, flow-mediated dilation percentage change; pp, percentage points; REML, restricted maximum likelihood method.
The outcome of the unadjusted linear regression while fasting and 2, 3, and 4 hours after eating
An unadjusted linear regression analysis was used to identify predictors of change in FMD (postprandial FMD% − fasting FMD%). Bubble plots depicting the unadjusted linear regression analyses at the 2-, 3-, and 4-hour postprandial time points are shown in Supplemental Figure 2. The unadjusted linear regression analyses at fasting are shown in Supplemental Figure 3. Substantial heterogeneity was observed (I2 >80%) across all variables and time points in the regression.
The outcome of the secondary aim: multivariable meta-regression while fasting and 2, 3, and 4 hours after eating
The final multivariable meta-regression model was selected following inspection of the adjusted R2 values. For 82 observations, the independent variables in a 2-hour multivariable meta-regression model were age, fasting FMD%, total energy and fat in the meal, sample size, percentage of male participants, and year of publication (Table 2). All other inspected multivariable models are listed in Supplemental Table 3. For 53 observations, the 3-hour regression model included the fasting FMD%, total energy and fat in the meal, percentage of male participants, and year of publication. The variables of age, BMI, fasting FMD%, total energy and fat in the meal, sample size, percentage of male participants, and year of publication were included in the 4-hour regression model, with 85 observations. Lastly, age, BMI, sample size, percentage of male participants, and year of publication were included in the fasting regression model, with 158 observations. There was no collinearity identified with a calculated variance inflation factor (VIF) of less than 2.5 for all variables in the regression models, and further investigation of collinearity is only appropriate where the variable VIF value is greater than 10. After adjusting for confounding variables, the multivariable meta-regression showed that at all postprandial time points, the magnitude of the FMD decrease after a meal was still significantly larger when the fasting FMD% was higher [Table 2; 2 hours, β = −0.33 (P < 0.001); 3 hours, β = −0.25 (P < 0.001); 4 hours, β = −0.27 (P < 0.001)]. Participant age was a significant independent predictor of a change in FMD% at 2 hours after the meal (β = −0.02; P = 0.039) when controlling for covariates. In multivariable models, at 2 and 4 hours after eating, there was no significant relation between the meal fat content and vascular function as assessed by FMD [Table 2; β = 0.01 (P = 0.493); β = 0.01 (P = 0.491)]. However, at 3 hours, there was a significant decrease in FMD with an increasing total fat content of the meal (β = −0.03; P = 0.016). At 4 hours after consumption, the total energy content of the meal was inversely related to the FMD response (β = −0.0003; P = 0.029). For the fasting FMD%, only age was determined to be an independent contributor to variation in the FMD effect size (β = −0.10; P < 0.001). The covariates in each model combined explained 35%, 43%, 68%, and 38% of the variance in the fasting FMD% and postprandial FMD% values at 2, 3, and 4 hours, respectively.
TABLE 2.
Multivariable meta-regression analysis exploring the effects of moderator covariates on FMD% effect-size variation between studies1
| Covariate | Slope | SE | Z value | 2-sided P value | 95% CI: lower | 95% CI: upper | Observations, n | I 2 | Adjusted R2 |
|---|---|---|---|---|---|---|---|---|---|
| 2-hour model | |||||||||
| Intercept | −104.97 | 58.52 | −1.79 | 0.073 | −219.67 | 9.72 | 82 | 88.4 | 0.428 |
| Age, years | −0.02 | 0.01 | −2.06 | 0.039 | −0.045 | −0.001 | |||
| Fasting FMD% | −0.33 | 0.08 | −4.28 | <0.001 | −0.48 | −0.18 | |||
| Total energy, kJ | −0.00004 | 0.00 | −0.32 | 0.745 | −0.0003 | 0.0002 | |||
| Total fat, En% | 0.01 | 0.01 | 0.69 | 0.493 | −0.02 | 0.03 | |||
| Sample size, n | 0.03 | 0.02 | 1.21 | 0.225 | −0.02 | 0.07 | |||
| Male, % | −0.003 | 0.00 | −0.79 | 0.429 | −0.01 | 0.01 | |||
| Year | 0.05 | 0.03 | 1.83 | 0.067 | -0.003 | 0.110 | |||
| 3-hour model | |||||||||
| Intercept | −79.33 | 52.81 | −1.50 | 0.133 | −182.84 | 24.17 | 53 | 64.9 | 0.683 |
| Fasting FMD% | −0.25 | 0.06 | −3.83 | <0.001 | −0.37 | −0.12 | |||
| Total energy, kJ | 0.0001 | 0.00 | 1.05 | 0.296 | −0.0001 | 0.0004 | |||
| Total fat, En% | −0.03 | 0.01 | −2.41 | 0.016 | −0.05 | −0.01 | |||
| Male, % | −0.004 | 0.01 | −0.75 | 0.456 | −0.02 | 0.01 | |||
| Year | 0.04 | 0.03 | 1.55 | 0.121 | −0.01 | 0.09 | |||
| 4-hour model | |||||||||
| Intercept | −52.20 | 46.64 | −1.12 | 0.263 | −143.61 | 39.22 | 85 | 89.4 | 0.379 |
| Age, years | −0.02 | 0.02 | −1.14 | 0.254 | −0.05 | 0.01 | |||
| BMI, kg/m2 | 0.05 | 0.06 | 0.87 | 0.385 | −0.06 | 0.17 | |||
| Fasting FMD% | −0.27 | 0.07 | −4.20 | <0.001 | −0.40 | −0.15 | |||
| Total energy, kJ | −0.0003 | 0.00 | −2.19 | 0.029 | −0.00051 | −0.00003 | |||
| Total fat, En% | 0.01 | 0.01 | 0.69 | 0.491 | −0.01 | 0.03 | |||
| Sample size, n | 0.03 | 0.01 | 1.95 | 0.052 | −0.0001 | 0.05 | |||
| Male, % | 0.00 | −0.001 | −0.23 | 0.821 | −0.01 | 0.01 | |||
| Year | 0.03 | 0.02 | 1.12 | 0.261 | −0.02 | 0.07 | |||
| Fasting model | |||||||||
| Intercept | −18.29 | 53.90 | −0.34 | 0.734 | −123.93 | 87.34 | 158 | 95.3 | 0.347 |
| Age, years | −0.10 | 0.02 | −6.32 | <0.001 | −0.13 | −0.07 | |||
| BMI, kg/m2 | −0.03 | 0.06 | −0.56 | 0.576 | −0.15 | 0.09 | |||
| Sample size, n | −0.0002 | 0.02 | −0.01 | 0.988 | −0.03 | 0.03 | |||
| Male, % | −0.003 | 0.01 | −0.64 | 0.521 | −0.01 | 0.01 | |||
| Year | 0.01 | 0.03 | 0.55 | 0.580 | −0.04 | 0.07 | |||
Random-effects meta-regression was conducted by restricted maximum likelihood. Abbreviations: En%, percentage of total meal energy; FMD%, flow-mediated dilation percentage change.
The outcome of the secondary aim: subgroup meta-analysis at fasting and 2, 3, and 4 hours after eating
Study and participant characteristics (moderators) that may impact the postprandial FMD response were identified a priori. Subgroup analyses were subsequently undertaken to identify whether moderator variable subcategories had different influences on FMD effect sizes (Table 3). The number of observations, MD in FMD, 95% CI: and P value are provided for each subgroup level of the moderator variable. Subgroup meta-analyses indicated a significantly lower fasting FMD% in older, heavier, and at-risk populations (P < 0.001). Additionally, these same patterns were seen at 4 hours after high-fat meal consumption for all variables except BMI, where a U-shaped relationship was noted (healthy weight, −1.86 pp [95% CI: −2.49 to −1.22 pp]; overweight, −0.68 pp [95% CI: −1.15 to −0.21 pp]; obese, −1.05 [95% CI: −1.46 to −0.63 pp]). A diagrammatic representation of FMD fasting and postprandial responses between a healthy and an at-risk participant can be seen in Figure 4. Participants with a higher fasting FMD% (>10%) had the largest postprandial FMD decrease at all postprandial time points (P < 0.001). The study design and risk of bias were not significant across all subgroup analyses (P > 0.05).
TABLE 3.
Subgroup analysis of mean difference in FMD based on study design, age, BMI, CVD risk, quality assessment, sex, FMD analysis method, total fat content, and fasting FMD% at fasting and 2-, 3-, and 4-hour postprandial time points1
| Time point | Variables and subgroups | Mean difference in FMD%, postprandial FMD% − fasting FMD% | Heterogeneity | |||
|---|---|---|---|---|---|---|
| N | MD (95% CI) | P value | I 2, % | QB | ||
| Age | ||||||
| Fasting |
<31 31–60 >60 |
53 93 18 |
8.04 (7.37–8.71) 5.84 (5.34–6.35) 4.01 (3.42–4.61) |
<0.001 <0.001 <0.001 |
93.4 97.2 88.9 |
<0.001 |
| 2 hours |
<31 31–60 >60 |
22 53 10 |
−1.17 (−2.06 to −0.28) −0.10 (−1.35 to −0.64) −0.76 (−1.27 to −0.24) |
<0.001 <0.001 0.008 |
94.9 92.4 59.9 |
0.664 |
| 3 hours |
<31 31–60 >60 |
29 21 1 |
−1.24 (−1.95 to −0.52) −0.94 (−1.48 to −0.39) −1.10 (−1.81 to −0.39) |
<0.001 <0.001 — |
83.2 77.8 — |
0.799 |
| 4 hours |
<31 31–60 >60 |
23 60 8 |
−1.89 (−2.63 to −1.15) −1.07 (−1.48 to −0.65) −0.23 (−0.86 to 0.41) |
<0.001 <0.001 0.003 |
93.7 94.8 68.8 |
0.003 |
| BMI, kg/m2 | ||||||
| Fasting |
18.5 to <25 25 to <30 >30 |
70 61 32 |
7.62 (6.99–8.25) 5.14 (4.57–5.72) 5.16 (4.60–5.71) |
<0.001 <0.001 <0.001 |
95.6 97.9 93.6 |
<0.001 |
| 2 hours |
18.5 to <25 25 to <30 >30 |
31 30 21 |
−0.97 (−1.59 to −0.35) −0.87 (−1.29 to −0.44) −1.01 (−1.45 to −0.58) |
<0.001 <0.001 <0.001 |
93.7 92.5 74.2 |
0.887 |
| 3 hours |
18.5 to <25 25 to <30 >30 |
34 15 4 |
−1.17 (−1.80 to −0.54) −0.83 (−1.58 to −0.08) −1.01 (−1.52 to −0.51) |
<0.001 <0.001 0.700 |
79.1 89.9 0.00 |
0.791 |
| 4 hours |
18.5 to <25 25 to <30 >30 |
35 37 18 |
−1.86 (−2.49 to −1.22) −0.68 (−1.15 to −0.21) −1.05 (−1.46 to −0.63) |
<0.001 <0.001 <0.001 |
91.4 92.9 88.1 |
0.013 |
| Fasting FMD% | ||||||
| 2 hours |
<10% >10% |
79 6 |
−0.85 (−1.15 to −0.55) −3.83 (−5.21 to −2.44) |
<0.001 0.006 |
91.8 78.8 |
<0.001 |
| 3 hours |
<10% >10% |
42 11 |
−0.52 (−0.92 to −0.12) −3.39 (−3.97 to −2.80) |
<0.001 0.812 |
78.3 0.0 |
<0.001 |
| 4 hours |
<10% >10% |
79 12 |
−1.02 (−1.36 to −0.68) −2.66 (−3.84 to −1.48) |
<0.001 <0.001 |
94.5 74.0 |
0.009 |
| Total fat, En% | ||||||
| 2 hours |
20–50 50–80 >80 |
37 45 3 |
−1.21 (−1.71 to −0.71) −0.79 (−1.21 to −0.37) −1.85 (−2.73 to −0.97) |
<0.001 <0.001 0.007 |
91.3 93.7 78.7 |
0.083 |
| 3 hours |
20–50 50–80 >80 |
12 27 14 |
−0.32 (−1.25 to 0.60) −0.46 (−0.90 to −0.02) −2.77 (−3.46 to −2.07) |
<0.001 <0.001 <0.001 |
82.9 68.5 66.5 |
<0.001 |
| 4 hours |
20–50 50–80 >80 |
40 40 11 |
−1.61 (−2.19 to −1.03) −0.71 (−1.20 to −0.21) −1.49 (−1.96 to −1.03) |
<0.001 <0.001 <0.001 |
91.3 95.4 83.5 |
0.027 |
| Study design | ||||||
| Fasting |
RCT Non-RCT |
115 51 |
6.37 (5.87–6.99) 6.15 (5.44–6.87) |
<0.001 <0.001 |
97.9 97.2 |
0.624 |
| 2 hours |
RCT Non-RCT |
58 27 |
−0.92 (−1.29 to −0.55) −1.23 (−1.85 to −0.60) |
<0.001 <0.001 |
92.1 94.6 |
0.410 |
| 3 hours |
RCT Non-RCT |
44 9 |
−1.07 (−1.57 to −0.58) −0.85 (−1.92 to 0.21) |
<0.001 0.002 |
86.6 65.2 |
0.714 |
| 4 hours |
RCT Non-RCT |
57 34 |
−1.20 (−1.63 to −0.77) −1.16 (−1.73 to −0.59) |
<0.001 <0.001 |
94.9 93.7 |
0.916 |
| CVD risk | ||||||
| Fasting |
Healthy Cardiometabolic disease or risk |
105 61 |
7.24 (6.71–7.77) 4.76 (4.29–5.22) |
<0.001 <0.001 |
97.5 95.9 |
<0.001 |
| 2 hours |
Healthy Cardiometabolic disease or risk |
52 33 |
−1.22 (−1.71 to −0.72) −0.79 (−1.10 to −0.47) |
<0.001 <0.001 |
95.4 81.2 |
0.150 |
| 3 hours |
Healthy Cardiometabolic disease or risk |
44 9 |
−0.99 (−1.51 to −0.47) −1.26 (−1.99 to −0.52) |
<0.001 <0.001 |
81.4 85.4 |
0.563 |
| 4 hours |
Healthy Cardiometabolic disease or risk |
51 40 |
−1.55 (−2.11 to −0.99) −0.83 (−1.17 to −0.50) |
<0.001 <0.001 |
94.7 90.2 |
0.032 |
| Risk of bias | ||||||
| Fasting |
Low risk Some concerns High risk |
11 115 40 |
6.19 (5.09–7.29) 6.29 (5.78–6.80) 6.34 (5.50–7.18) |
<0.001 <0.001 <0.001 |
85.5 97.3 98.6 |
0.978 |
| 2 hours |
Low risk Some concerns High risk |
11 51 23 |
−0.70 (−1.52 to 0.11) −1.19 (−1.64 to −0.74) −0.67 (−0.91 to −0.42) |
<0.001 <0.001 <0.001 |
93.3 93.3 46.1 |
0.129 |
| 3 hours |
Low risk Some concerns High risk |
4 38 11 |
−1.05 (−1.77 to −0.33) −1.25 (−1.80 to −0.70) −0.27 (−1.09 to 0.54) |
0.701 <0.001 <0.001 |
0.0 85.1 81.8 |
0.146 |
| 4 hours |
Low risk Some concerns High risk |
6 66 19 |
−0.74 (−1.45 to −0.03) −1.26 (−1.66 to −0.86) −0.96 (−1.82 to −0.09) |
<0.001 <0.001 <0.001 |
87.1 93.9 94.0 |
0.430 |
| Sex | ||||||
| Fasting |
Male Female Mixed |
67 16 80 |
6.57 (5.91–7.23) 6.68 (5.30–8.06) 6.05 (5.45–6.65) |
<0.001 <0.001 <0.001 |
98.4 97.9 96.6 |
0.452 |
| 2 hours |
Male Female Mixed |
39 6 39 |
−1.14 (−1.62 to −0.66) −0.34 (−1.36 to −0.68) −0.99 (−1.48 to −0.51) |
<0.001 <0.001 <0.001 |
95.8 95.1 82.1 |
0.379 |
| 3 hours |
Male Female Mixed |
21 3 29 |
−1.62 (−2.46 to −0.79) 0.21 (−0.31 to 0.73) −0.78 (−1.30 to −0.25) |
<0.001 0.993 <0.001 |
87.2 0.0 77.8 |
<0.001 |
| 4 hours |
Male Female Mixed |
33 13 42 |
−1.29 (−1.95 to −0.64) −0.53 (−1.53 to 0.46) −1.31 (−1.74 to −0.88) |
<0.001 <0.001 <0.001 |
97.3 94.3 88.2 |
0.364 |
| FMD analysis | ||||||
| Fasting |
Manual measurement Continuous edge-detection |
64 102 |
7.22 (6.47–7.98) 5.71 (5.27–6.16) |
<0.001 <0.001 |
97.2 97.4 |
0.001 |
| 2 hours |
Manual measurement Continuous edge-detection |
32 53 |
−1.02 (−1.71 to −0.33) −1.01 (−1.34 to −0.68) |
<0.001 <0.001 |
94.7 90.9 |
0.986 |
| 3 hours |
Manual measurement Continuous edge-detection |
36 17 |
−1.30 (−1.87 to −0.73) −0.57 (−1.24 to 0.10) |
<0.001 <0.001 |
77.8 88.4 |
0.105 |
| 4 hours |
Manual measurement Continuous edge-detection |
27 64 |
−1.28 (−2.08 to −0.47) −1.15 (−1.51 to −0.78) |
<0.001 <0.001 |
95.7 93.3 |
0.773 |
A maximum likelihood approach was undertaken for a random-effects subgroup meta-analysis. Subgroup analyses were conducted based on physiological, theoretical, and empirical associations with FMD. FMD is measured as the relative percentage change in the peak reactive hyperemia diameter from the baseline diameter (FMD%). The mean difference in the FMD% was calculated as the fasting FMD% subtracted from the postprandial FMD%, termed the FMD change. Heterogeneity was assessed by the I2 statistic. QB, assesed the between-group heterogeneity of effect sizes in studies. QB values ≤0.05 were considered as a statistically significant impact of potential modifiers on the difference between subgroups. Abbreviations: CVD, cardiovascular disease; En%, percentage of total meal energy; FMD, flow-mediated dilation; FMD%, flow-mediated dilation percentage change; MD, mean difference; RCT, randomized controlled trial.
FIGURE 4.

Diagrammatic representation of the arterial responses to FMD during fasting and after a high-fat meal in healthy and at-risk participants. Artery cross-sections show the diameter, FMD%, and FMD change. The at-risk participant group included individuals who presented with at least 1 CVD risk factor or were diagnosed with coronary artery disease. Diagrams are not to scale. Abbreviations: CVD, cardiovascular disease; FMD, flow-mediated dilation; FMD%, flow-mediated dilation percentage change; HFM, high-fat meal; pp, percentage points.
Risk of bias
The majority of the studies included in this work had a moderate risk of bias (n = 86) due to a designation of some concerns in at least 1 risk domain (Supplemental Figure 4). Five studies were judged as having a low risk, while 40 were determined to have a high risk of bias. Almost all studies supplied insufficient information about the randomization and allocation concealment procedures, leading to a designation of “no information.” Additionally, the risk of bias arose due to inadequate information provided regarding the researcher's prespecified data analysis plan. Overall, studies showed a low risk of bias in the outcome assessment, with most following the expert guidelines available at the time of assessment (167, 168).
Publication bias
A visual inspection of funnel plots showed symmetrical distribution of study effects at each time point. Egger's regression asymmetry test confirmed a lack of publication bias (2 hours, P = 0.679; 3 hours, P = 0.063; 4 hours, P = 0.812; Figure 5).
FIGURE 5.

Publication bias was assessed by funnel plot of all studies in the meta-analysis at (A) 2 hours, (B) 3 hours, and (C) 4 hours after high-fat meal consumption. Abbreviation: FMD%, flow-mediated dilation percentage change.
Discussion
Despite variability in participant groups and meal contents, a high-fat meal adversely affects endothelial function, measured by FMD, by mean changes from fasting of −1.02 pp (95% CI: −1.34 to −0.70 pp), −1.04 pp (95% CI: −1.48 to −0.59 pp), and −1.19 pp (95% CI: −1.53 to −0.84 pp) at 2, 3, and 4 hours after consumption. A 1-pp decrease in fasting FMD% is associated with a 9% increase in the risk of cardiovascular events (36). Given the similar reduction in FMD after a high-fat meal, this could indicate an increased CVD risk in the postprandial state. The postprandial endothelial response is modified by the participant's age (2 hours, Table 2; 4 hours, Table 3), BMI (4 hours, Table 3), and health status (4 hours, Table 3). After controlling for confounding variables (multivariable analyses, Table 2), the fat content of a meal was negatively associated with the endothelial function at 3 hours but not at 2 or 4 hours after eating. There was no effect of study design (use of randomization) or risk of bias; thus, these factors did not impact how the analysis was conducted.
Older, at-risk participants were less responsive to FMD during fasting and showed a decreased capacity to respond to FMD after a high-fat meal (2 hours and fasting, Table 2; 4 hours and fasting, Table 3). Ageing causes an imbalance between vasoactive factors, particularly a reduction in NO, brought about by increased reactive oxygen species (ROS) and oxidative stress (169). A reduction in NO bioavailability leads to reduced vascular tone and, thus, an inability to respond to the hemodynamic stimulus. Provision of a high-fat meal with tetrahydrobiopterin, a NO-synthesis cofactor that decreases with ageing (170), has been shown to enhance the FMD response at 4 hours in postmenopausal women and age-matched men compared with a high-fat meal alone (129). This work found interactions between health status and both fasting and postprandial FMDs (Figure 4). Though health status cannot be determined to be an independent predictor of the FMD response, individuals who presented with either cardiometabolic disorders (e.g., participants with diabetes, metabolic syndrome, hypothyroidism, or cardiovascular disease) or cardiometabolic risk factors were more likely to have a lower FMD% at fasting and were less able to respond to the high-fat meal challenge. These conditions are associated with inflammation, which causes activation of NAD(P)H oxidase (171), increased levels of ROS, and subsequent endothelial dysfunction. Thus, certain participant characteristics can modify the endothelial function, both before and after high-fat meal consumption (Figure 4). Therefore, consumption of high-fat meals could further exacerbate endothelial dysfunction in at-risk individuals.
High-fat meals reduce the ability of blood vessels to dilate in response to FMD by reducing NO bioavailability (17). A single, high-fat meal has been hypothesized to cause a reduction in NO bioavailability through an increase in oxidative stress that ultimately leads to endothelial dysfunction through multiple mechanisms (18). Postprandial lipemia has been shown to be associated with increased oxidative stress and decreased FMDs in healthy, male participants (22). Circulating triglyceride-rich lipoproteins and their remnants are also associated with endothelial dysfunction and CVD risks (172, 173). This work showed that the percentage fat content of the meals was inversely associated with the postprandial change in FMD at 3 hours, indicating a reduced vessel response as the fat percentage increased. Total energy intake was also negatively associated with the FMD change at 4 hours after consumption. Therefore, it is likely that the simple act of eating any high-energy meal could result in an increase in ROS, which would reduce FMD. However, no previous studies have measured hourly fasting FMD% results to explore the magnitude of this phenomenon over time.
Phenotypic metabolic flexibility is the ability of an organism to respond and adapt to changes in metabolism and energy demands (174). A high-fat meal challenge enables metabolic flexibility and small changes in endothelial responses to be detected, which might not be apparent at fasting. A systematic review (175) of 61 studies providing various challenge meals showed that utilization of a nutritional stress test enabled the assessment of subtle differences in health status. The current systematic review clearly shows that in older, heavier, and more cardiometabolically at-risk populations, there are smaller changes in FMD from fasting levels at 4 hours after consumption compared to levels in young, healthy-weight populations. At-risk participants showed less capacity to respond to a high-fat meal, exhibiting greater metabolic inflexibility. Thus, we emphasize that there is potential to use the postprandial FMD to detect early endothelial dysfunction before the fasting FMD is impaired.
The sex of the participant independently moderated the postprandial FMD at 3 hours after consumption. No changed postprandial response from fasting could be detected within the female-only studies, compared to reduced postprandial FMD% values in male-only and mixed-sex studies. However, the small sample size for female-only studies suggests that this effect should be further explored. The cardioprotective effect of estrogen has been well established (158, 176). Harris et al. (72) demonstrated that premenopausal women were protected from a high-fat meal challenge during periods of elevated estrogen, during the follicular phase of the menstrual cycle. Moreover, while no differences in 17β-estradiol were observed between male and female participants, females in the menses phase were still protected compared to males. The participant menstrual cycle phase was not consistently reported in the studies in this work, making it difficult to interpret the impact on FMD. The impact of sex differences needs to be interpreted with caution due to the low sample size. In future research, differences between males and females should be considered, and the female menstrual cycle phase should be reported to further understand the cardioprotective nature of estrogen.
Strengths and limitations
The current work is strengthened by the high number and variety of studies, which made a meta-analysis of potential modifiers possible. A rigorous compilation of participant characteristics, study design, FMD methodology, and meal contents was conducted. A conservative statistical approach was adopted to avoid spurious results. Some limitations include the limited number of time points at which the postprandial FMD was measured in the studies. Forty-six out of the 90 studies included in the meta-analysis only measured the FMD at 1 postprandial time point. Thus, conclusions on the FMD response after a meal can only be drawn based on between-subject comparisons, not within-subject comparisons. Second, as there are studies with multiple groups, there is a possibility that any given study might have contributed more than 1 value to the summary metric, leading to repeated estimates. There is a potential increased type I error rate that is associated with multiple statistical tests. Third, results could possibly be affected by regression to the mean. Fourth, meal composition significantly modified the magnitude of the postprandial FMD response. The percentage of carbohydrate and protein of the meal showed an inverse relationship with the FMD compared with the percentage of fat at 3 hours after consumption, suggesting a macronutrient-specific effect on the FMD and endothelial function. However, specific meal contents were often not well reported; specifically, the type of fatty acids was not reported in an overwhelming number of complex, mixed-meal studies.
Recommendations for future research
Standardization of future research methodology would allow for better comparisons and interpretation of studies. In addition, assessing postprandial FMDs would be advantageous to determine the effectiveness of therapies to treat or reduce CVD risks. Based on the findings here, the following recommendations should be considered to assess the benefits of CVD treatment regimens, including drugs, extracts, foods, supplements, or exercise regimens:
Follow expert guidelines for FMD protocols (6).
Provide a stress-test meal containing at least 60 g of a fat product such as whipped cream or fried food. Alternatively, provide at least 60% energy from fat, less than 30% energy from simple carbohydrates, and less than 10% energy from protein, with a total energy content of at least 3700 kJ. In addition, the macronutrient breakdown of meal challenges should be reported thoroughly.
Analyze population groups separately: that is, apparently healthy compared with diabetic populations; older compared with younger cohorts; and men compared with women.
Measure endothelial function data while fasting (just before the test meal) and at multiple time points, especially including 3 and 4 hours after consumption.
The FMD effects should be compared within populations over standardized periods of time during the intervention period.
Researchers seeking to undertake postprandial FMD studies should consider addressing research questions not already answered by the current body of published FMD research.
If feasible, interventions should be run over 6 hours, measuring FMD hourly, to understand the time course of lipid-induced endothelial dysfunction. The measurement of postprandial FMD would be a useful marker to assess the efficacy of potential therapeutics to reduce CVD risks. However, longitudinal cohort studies are required to determine whether this could be used for early detection of CVD risks.
Conclusions
We have, for the first time, collectively quantified the effects of a single, high-fat meal on the postprandial decline in the FMD% compared to fasting, in 164 groups of varying populations, at differing postprandial time points, and with protocols obtained from 90 distinct papers. We are unaware of any other paper that has systematically quantified this relationship. This response was varied across 3 different time points in 3 discrete meta-analyses. Postprandial lipemia reduces NO bioavailability, thereby causing transient endothelial dysfunction, which can be detected and quantified by FMD. These results support the rationale that the postprandial FMD could be a more sensitive risk marker for cardiometabolic disease, offering further insight into endothelial health beyond information gained from the fasting FMD alone.
Supplementary Material
ACKNOWLEDGEMENTS
JJF acknowledges support and statistical advice from Dr. Catherine Martin of the Biostatistics Consulting Platform, Monash University.
The authors’ responsibilities were as follows—JJF, GW, and ALD: designed the research; JJF and NJK: analyzed the data; JJF: drafted the manuscript; GW: had primary responsibility for the final content; and all authors: conducted research, read, revised and approved the final manuscript.
Author disclosures: The authors report no conflicts of interest.
Notes
This systematic review was supported by a Monash University PhD Scholarship to JJF.
Supplemental Tables 1–3 and Supplemental Figures 1–4 are available from the “Supplementary data” link in the online posting of the article and from the same link in the online table of contents at https://academic.oup.com/ajcn/.
Abbreviations used: CVD, cardiovascular disease; FMD, flow-mediated dilation; FMD%, flow-mediated dilation percentage change; pp, percentage points; RCT, randomized controlled clinical trials; ROS, reactive oxygen species; VIF, variance inflation factor.
Contributor Information
Juanita J Fewkes, Department of Nutrition, Dietetics and Food, School of Clinical Sciences, Faculty of Medicine Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia; Victorian Heart Institute, Monash University, Clayton, Victoria, Australia.
Nicole J Kellow, Department of Nutrition, Dietetics and Food, School of Clinical Sciences, Faculty of Medicine Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia; Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, Victoria, Australia.
Stephanie F Cowan, Department of Nutrition, Dietetics and Food, School of Clinical Sciences, Faculty of Medicine Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia.
Gary Williamson, Department of Nutrition, Dietetics and Food, School of Clinical Sciences, Faculty of Medicine Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia; Victorian Heart Institute, Monash University, Clayton, Victoria, Australia.
Aimee L Dordevic, Department of Nutrition, Dietetics and Food, School of Clinical Sciences, Faculty of Medicine Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia; Victorian Heart Institute, Monash University, Clayton, Victoria, Australia.
Data Availability
Data described in the manuscript will be made available upon request, pending application and approval.
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