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The American Journal of Clinical Nutrition logoLink to The American Journal of Clinical Nutrition
. 2022 Jun 6;116(3):699–729. doi: 10.1093/ajcn/nqac153

A single, high-fat meal adversely affects postprandial endothelial function: a systematic review and meta-analysis

Juanita J Fewkes 1,2, Nicole J Kellow 3,4, Stephanie F Cowan 5, Gary Williamson 6,7,, Aimee L Dordevic 8,9
PMCID: PMC9437993  PMID: 35665799

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:

graphic file with name TM0001.gif (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.

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.

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
1

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.

2

Denotes studies that are included in the meta-analysis.

3

Denotes studies that were excluded due to unreported FMD data.

4

Denotes studies that were excluded due to use of proximal cuff occlusion FMD protocol.

5

Denotes studies that were excluded due to FMD not being measured at the hourly mark.

6

Denotes studies that were excluded due to conducting the clinical trial in the afternoon.

7

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.

FIGURE 3

FIGURE 3

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
1

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
1

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.

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.

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:

  1. Follow expert guidelines for FMD protocols (6).

  2. 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.

  3. Analyze population groups separately: that is, apparently healthy compared with diabetic populations; older compared with younger cohorts; and men compared with women.

  4. Measure endothelial function data while fasting (just before the test meal) and at multiple time points, especially including 3 and 4 hours after consumption.

  5. The FMD effects should be compared within populations over standardized periods of time during the intervention period.

  6. 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

nqac153_Supplemental_File

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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