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. 2022 Jan 31;600(6):1299–1312. doi: 10.1113/JP280756

Nutrient timing and metabolic regulation

Harry A Smith 1, James A Betts 1,
PMCID: PMC9305539  PMID: 35038774

Abstract

Daily (circadian) rhythms coordinate our physiology and behaviour with regular environmental changes. Molecular clocks in peripheral tissues (e.g. liver, skeletal muscle and adipose) give rise to rhythms in macronutrient metabolism, appetite regulation and the components of energy balance such that our bodies can align the periodic delivery of nutrients with ongoing metabolic requirements. The timing of meals both in absolute terms (i.e. relative to clock time) and in relative terms (i.e. relative to other daily events) is therefore relevant to metabolism and health. Experimental manipulation of feeding–fasting cycles can advance understanding of the effect of absolute and relative timing of meals on metabolism and health. Such studies have extended the overnight fast by regular breakfast omission and revealed that morning fasting can alter the metabolic response to subsequent meals later in the day, whilst also eliciting compensatory behavioural responses (i.e. reduced physical activity). Similarly, restricting energy intake via alternate‐day fasting also has the potential to elicit a compensatory reduction in physical activity, and so can undermine weight‐loss efforts (i.e. to preserve body fat stores). Interrupting the usual overnight fast (and therefore also the usual sleep cycle) by nocturnal feeding has also been examined and further research is needed to understand the importance of this period for either nutritional intervention or nutritional withdrawal. In summary, it is important for dietary guidelines for human health to consider nutrient timing (i.e. when we eat) alongside the conventional focus on nutrient quantity and nutrient quality (i.e. how much we eat and what we eat).

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Keywords: circadian, meal timing, metabolism, rhythms


Abstract figure legend Timing of meal‐intake across the day can be considered in both absolute (i.e. clock time) and relative terms (i.e. to other events across the day). In particular meals can be considered relative to predictable cycles of sleep‐wake (e.g. nocturnal feeding) and fasting‐feeding (e.g. breakfast and intermittent fasting). Likewise, the timing of meal‐intake throughout the day can also be considered relative to peaks in the rhythmic control of physiology (e.g. muscle transcript accumulation and/or appetite regulation). Collectively, consideration of these factors provides insight into the complexity of metabolic regulation within the context of nutrient timing.

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Introduction

Life on earth has evolved within the context of a repetitive cycle of ca 24 h, whereby environmental variables such as light exposure predictably oscillate during each daily period. As such, natural selection has provided almost all organisms on this planet with endogenous circadian rhythms to help anticipate impending environmental challenges and thus pre‐emptively adjust our physiology, metabolism and/or behaviour accordingly (Jagannath et al. 2017). The mammalian circadian timing system comprises both a central ‘master’ clock located in the suprachiasmatic nucleus of the hypothalamus and an integrated network of peripheral clocks located throughout various organs, tissues and cell‐types (Albrecht, 2017). Collectively, these molecular clocks facilitate the coordinated disposal, degradation, synthesis and recycling of metabolic substrates in order that our periodic delivery of dietary nutrients (i.e. meal times) can appropriately meet our ongoing physiological requirements (Frayn, 2019). The objective of this review is to briefly summarise the mammalian circadian timing system and the daily rhythmicity of macronutrient metabolism, energy expenditure and appetite regulation, before considering how the alignment of daily feeding patterns with these underlying rhythms can impact human health.

The mammalian circadian timing system

The suprachiasmatic nucleus can translate repeating environmental stimuli, such as photic input, into the appropriate biological rhythms via a variety of signalling pathways, such as autonomic stimulation, endocrine action and body temperature modification (Lewy et al. 1999; Brown et al. 2002; Berson, 2003; Buhr et al. 2010; Slominski et al. 2012). Translation of murine work to humans highlights that molecular regulation of circadian rhythms at a cellular level involves the expression of clock genes, which can maintain approximate 24 h rhythmicity via interlocking transcriptional–translational feedback loops with both positive and negative limbs (Mazzoccoli et al. 2012; McGinnis & Young, 2016). The positive limb is characterised by the proteins circadian locomotor output cycles kaput (CLOCK), its paralogue neuronal PAS domain protein 2 (NPAS2), and brain and muscle ARNT‐like 1 (BMAL1), which are typically found in the nucleus (Kwon et al. 2006). Whilst this positive part of the loop targets clock‐controlled genes, it also activates rhythmic transcription within the negative limb, including the Period (PER) and Cryptochrome (CRY) genes (Mohawk et al. 2012); this serves to inhibit the activity of CLOCK:BMAL1 prior to degradation, thereby ending repression of the positive aspect and initiating a new cycle of transcription (Table 1) (Sahar & Sassone‐Corsi, 2012; Buhr & Takahashi, 2013; St John et al. 2014). The broad importance of proper circadian alignment is clearly apparent in the expression of this core clock machinery throughout mammalian biology, with 3–16% of all mRNA exhibiting rhythmic daily expression (Mohawk et al. 2012; Albrecht, 2017; Dierickx et al. 2018).

Table 1.

Name, definition and basic function of the ‘core’ circadian clock machinery involved in the transcription–translation feedback loop

Name Definition Function Reference
Ebox Enhancer box Promoter region that regulates cellular transcriptional activity Hao et al. (1997)
RORE Retinoic acid‐related orphan receptor response element. Promoter region that regulates cellular transcriptional activity Cook et al. (2015)
CLOCK Circadian locomotor output cycles kaput Forms heterodimer with BMAL1 which binds to and activates the Ebox thereby stimulating transcription and translation of Per and Cry Buhr & Takahashi (2013)
NPAS2 Neuronal PAS domain protein 2 Paralogue of CLOCK. Forms heterodimer with BMAL1 which binds to and activates the Ebox thereby activating transcription and translation of Per and Cry Buhr & Takahashi (2013)
BMAL1 (Arntl) Brain and muscle ARNT‐like 1 Forms heterodimer with CLOCK which binds to and activates the Ebox thereby activating transcription and translation of Per and Cry Buhr & Takahashi (2013)
Cry1,2,3 Cryptochrome 1, 2, 3 Form a complex with Period proteins. Inactivates Ebox thereby inhibiting transcription and translation of CLOCK and BMAL1 Ko & Takahashi (2006)
Per1, 2, 3 Period 1, 2, 3 Form a complex with cryptochrome proteins. Inactivates Ebox thereby inhibiting transcription and translation of CLOCK and BMAL1 Ko & Takahashi (2006)
NR1D1/2 (REV‐ERBα/β) Nuclear receptor subfamily 1 group D member 1/2 Repression of BMAL1 gene expression through binding with RORE sites Guillaumond et al. (2005)
ROR‐α/β/γ Retinoic acid‐related orphan receptors Transcriptional activator for BMAL1 through binding with RORE sites Guillaumond et al. (2005)

Circadian rhythmicity is particularly evident in signalling pathways within peripheral tissues that are vital for effective metabolic regulation (e.g. liver, muscle, and adipose tissue) (Fig. 1). Specifically, approximately 6–10% of genes in murine hepatocytes display robust circadian rhythms in a tissue‐specific manner, with gene clusters targeting carbohydrate and lipid metabolism (Akhtar et al. 2002; Robles et al. 2014). Likewise, genome‐wide transcriptome analysis of skeletal muscle samples from humans reveals high amplitude oscillations for the core clock genes ARNTL (BMAL1), NPAS2, CLOCK, PER2, PER3, CRY2, NR1D1 (REV‐ERBα) and ROR‐α (Perrin et al. 2018). Notably, these peaks in transcript accumulation clustered at 16.00 h (for genes implicated in muscle force production and mitochondrial activity) and at 04.00 h (for genes implicated in immune function and inflammation), with rhythmicity also present for genes linked to glucose, lipid and protein homeostasis (Perrin et al. 2018). Lastly, approximately 10–20% of the white adipose tissue transcriptome displays 24 h variation, with meaningful temporal oscillations present in both core clock (PER1, PER2, PER3, CRY2, BMAL1 and DBP) and metabolic (REVERBα, RIP140 and PGC1α) genes under diurnal and constant conditions (Ptitsyn et al. 2006; Zvonic et al. 2006; Otway et al. 2011; Christou et al. 2019). Within adipocytes, these core clock genes play an important role in regulating lipolysis, adipogenesis and adipocyte hypertrophy, and so are central to proper understanding of nutrient balances and obesity (Grimaldi et al. 2010; Shimba et al. 2011; Guo et al. 2012; Paschos et al. 2012).

Figure 1. The central clock is located in the brain in the suprachiasmatic nucleus (SCN) and is robustly driven by regular cycles of light and dark.

Figure 1

Core clock machinery is also present in numerous metabolically important peripheral tissues such as the liver, skeletal muscle, adipose tissue and gut. Given the role of these tissues in processing ingested nutrients, it is perhaps unsurprising that the effects of meal timing on metabolism are mediated by these peripheral clocks.

Rhythms in macronutrient metabolism

With regard to carbohydrate metabolism, whilst basal blood glucose can be relatively elevated upon waking (i.e. the dawn phenomenon), post‐prandial glucose tolerance is generally lower in the evening than in the morning (Van Cauter et al. 1989, 1992, 1997; Simon et al. 1994; Qian & Scheer, 2016). The former is subject to endocrine regulation and driven by hepatic glycogenolysis and gluconeogenesis (Radziuk & Pye, 2006), whereas the latter is primarily regulated by the positive and negative limbs of the transcriptional feedback loop that drives diurnal rhythms in β‐cell responsiveness, insulin secretion/clearance and insulin sensitivity (Baker & Jarrett, 1972; Aparicio et al. 1974; Boden et al. 1996; Asher et al. 2008; Lamia et al. 2009; Saad et al. 2012; Morris et al. 2015 b; Perrin et al. 2018).

By contrast, lipid metabolism favours progressively elevated circulating non‐esterified fatty acids, triglyceride and cholesterol later in the day and overnight (Zimmet et al. 1974; Morgan et al. 1999; Pan & Hussain, 2007; Ang et al. 2012; Dallmann et al. 2012; Yoshino et al. 2014), which is a reflection of diurnal rhythms in lipid storage and mobilisation as opposed to recent food intake (Yoshino et al. 2014; Held et al. 2020). Specifically, a combination of animal and human studies suggests that a net shift in fatty acid metabolism from oxidation towards lipogenesis occurs throughout the day, with circadian regulation of intestinal triglyceride absorption, acylcarnitines, mitochondrial oxidative capacity, very‐low‐density lipoprotein secretion and insulin secretion all contributing to this daily variance (Marrino et al. 1987; Lee et al. 1992; Pan & Hussain, 2007; Ang et al. 2012; Pan et al. 2013; Yoshino et al. 2014; van Moorsel et al. 2016; Sprenger et al. 2021).

Finally, in relation to protein metabolism, the majority of amino acids (including all essential, some non‐essential and some conditionally essential) display circadian rhythmicity, with peak values occurring between 12.00 and 20.00 h and with lowest values at 04.00–08.00 h (Feigin et al. 1967; Wurtman et al. 1967; Feigin et al. 1968; Grant et al. 2019). Variation in the generation and release of amino acids from assorted tissues may underpin this rhythm, including rhythmicity in protein digestion, and absorption (Barattini et al. 1993; Fiorucci et al. 1995; Qandeel et al. 2009a , b ). The net effect of this variance in amino acid availability on tissue turnover is that protein synthesis is higher during the day and protein oxidation higher at night, with no clear temporal variance in the rate of protein breakdown (Garlick et al. 1980; Adam & Oswald, 1981; Kelu et al. 2020). This apparent day–night rhythm of muscle protein synthesis is not modulated by the relative absence of dietary protein at night, nor the overnight endocrine response (Beelen et al. 2008; Betts et al. 2011) but is consistent with the rhythmic regulation of MyoD (a myogenic transcription factor) by the CLOCK:BMAL1 complex (Andrews et al. 2010; Perrin et al. 2018).

Rhythms in energy expenditure

In stark contrast to the periodic arrival of dietary nutrients from regular daily meals, our ongoing metabolic requirements present a relentless need for continuous energy expenditure. Nonetheless, although unceasing, the rate of thermogenesis also exhibits variability over time and is integral to circadian regulation. For example, elevated body temperature is generally observed during daylight/waking hours, with lower temperature coincident with the dark/sleeping phase amongst most humans, which contributes to synchronising central and peripheral clock machinery (Edwards et al. 2002; Buhr et al. 2010). Indeed, constant routine protocols (removal of environmental/behavioural stimuli through prolonged wakefulness and even distribution of energy intake) reveal that heat production, oxygen uptake (V˙O2), and carbon dioxide production (V˙CO2) are all highest during the biological morning (Krauchi & Wirz‐Justice, 1994; Spengler et al. 2000), whereas a recent forced desynchrony protocol (non‐standard daily behavioural patterns under dim light conditions) demonstrated that resting metabolic rate is lowest during the late biological night and highest ∼12 h later in the biological afternoon/evening (Zitting et al. 2018). Interestingly resting energy expenditure also changes overnight with differing stages of sleep (as assessed by sleep encephalography). Generally energy expenditure tends to be highest during lighter/earlier phases, and lowest during the deepest/later stages of sleep (Brebbia & Altshuler, 1965; Fontvieille et al. 1994), but some studies have failed to replicate any differences between stages of sleep (Webb & Hiestand, 1975; Haskell et al. 1981; White et al. 1985; Palca et al. 1986; Jung et al. 2011). Beyond basal metabolic requirements (i.e. under fasted and resting conditions), an endogenously driven daily rhythm has been reported in diet‐induced thermogenesis (i.e. the thermic effect of feeding), with ∼20–44% higher values in the morning relative to the evening (Romon et al. 1993; Bo et al. 2015; Morris et al. 2015 a). However, recent evidence indicates that this is apparent rhythmicity in diet‐induced thermogenesis can be accounted for by the underlying circadian variation in resting metabolic rate (Ruddick‐Collins et al. 2021). Finally, although highly individual, a range of contrasting diurnal patterns of physical activity thermogenesis have been identified, with more intense physical activity often favoured earlier in the day (Maddison et al. 2009; Sartini et al. 2015; Jansen et al. 2018).

Rhythms in appetite regulation

Evidence for circadian rhythms in appetite and appetite regulatory peptides has been generated using experimental protocols involving both the constant routine and forced desynchrony protocols introduced above. These studies have revealed that hunger is typically lowest in the morning (∼08.00 h) and peaks in the evening (∼20.00 h), when satiety also tends to be lowest (Scheer et al. 2013; Sargent et al. 2016; Rynders et al. 2020; Templeman et al. 2021b ). This robust rhythmicity in appetite ratings occurs independent of time since waking, inter‐meal intervals and the energy content of meals (Scheer et al. 2013), but is nonetheless entirely consistent with the typical feeding pattern in westernised societies, whereby energy intake tends to be lowest in the morning and highest in the evening (NHANES, 2016).

Our recent work employed a semi‐constant routine (i.e. continuous feeding throughout waking hours) to examine the 24 h profile of appetite regulatory hormones (Templeman et al. 2021b ). In that study we reported diurnal rhythms in leptin (peak 00.32 h) and unacylated ghrelin (peak 08.26 h) (Fig. 2). Notably, despite nominally being classified as a hunger hormone, the observed rhythm of ghrelin was approximately antiphasic with that of subjective hunger and ratings of prospective food consumption, which peaked as expected in the evening (i.e. ca 20.00–21.00 h) – this phase separation between peaks in appetite ratings and appetite hormones was also evident in another recent study (Rynders et al. 2020). In addition to leptin and ghrelin, such daily rhythmicity has also been identified for other appetite regulatory peptides, such as: glucagon‐like peptide‐1 (peak ∼10.00 h, nadir ∼17.00 h), peptide YY (peak at ∼14.00 h, nadir ∼04.00 h) and pancreatic polypeptide (peak ∼15.00 h, nadir ∼09.00 h) (Johns et al. 2006; Hill et al. 2011; Galindo Munoz et al. 2015; Rynders et al. 2020).

Figure 2. Diurnal profiles of hunger.

Figure 2

Diurnal rhythms in unacylated ghrelin, leptin and subjective hunger under conditions of semi‐constant routine (i.e. hourly feeding during waking hours only) relative to melatonin profile (grey) and light/dark (yellow/blue respectively)

Nutrient timing

Endogenously controlled rhythms are entrained to environmental time cues known as zeitgebers or ‘time givers’ (Aschoff, 1954; Aschoff & Pohl, 1978). These include naturally repeating cycles of light–dark, waking–sleeping and activity–rest but also our transitions between the fed–fasted state. As such, the scheduling/alignment of eating occasions (i.e. chrono‐nutrition; Flanagan et al. 2021), and thus the availability of exogenous nutrients, relative to other regular daily events can serve as a powerful signal to help entrain the endogenous rhythms described in the previous sections (la Fleur et al. 2001; Zambon et al. 2003; Duffy & Czeisler, 2009; Figueiro et al. 2012; Leproult et al. 2014; Cheung et al. 2016; Tanaka et al. 2020). Therefore, in addition to the conventional focus of dietary guidelines for human health regarding nutrient quantity and nutrient quality (i.e. how much we eat and what we eat), it is also important to consider nutrient timing (i.e. when we eat).

Nutrient timing can be understood in terms of both absolute timing (i.e. objective time‐of‐day, clock time) and relative timing (i.e. with respect to when other relevant events occur and/or usually occur, e.g. wake/sleep, exercise, other meals). The physiological responses to identical meals consumed at different times of day can vary dramatically. For example, as noted earlier, carbohydrate, lipid and protein metabolism all exhibit marked morning–evening differences (Van Cauter et al. 1992; Yoshino et al. 2014; Morris et al. 2015 a; Leung et al. 2019), yet the complete absence of daily food intake for 24 h (i.e. fasting) can eradicate the circadian rhythm in hepatic gene expression that would otherwise occur with a regular meal pattern (Vollmers et al. 2009). Even just a short delay in habitual meal timing can alter Per2 phase in adipose tissue, with corresponding phase shifts in systemic metabolites and hormones but without altering the temporal pattern of melatonin or cortisol (robust markers of the central clock) – all consistent with the idea that peripheral rhythms are closely matched to the absolute time of feeding each day (Schoeller et al. 1997; Wehrens et al. 2017; Gu et al. 2020). Indeed, feeding responsive hormones such as insulin, glucagon and insulin‐like growth factor 1 appear to be especially potent modulators of clock gene and/or protein expression in multiple tissues – at least in murine models, but emerging evidence is now beginning to demonstrate this in humans (Tahara et al. 2010; Mukherji et al. 2015; Sun et al. 2015; Ikeda et al. 2018; Crosby et al. 2019; Tuvia et al. 2021).

Extended overnight fasting

In terms of relative nutrient timing, the ‘other relevant events’ that can both influence and be influenced by the response to feeding may include light exposure, sleeping, exercise and, critically, other eating occasions. Breakfast is an eating occasion with particular potential to serve as a zeitgeber and to modify subsequent responses, since this first meal of the day generally marks the end of the overnight period of darkness, sleeping, resting and fasting, whilst also preceding all other daily events. The capacity of breakfast to exert a marked influence on metabolic control later in the day is perhaps best illustrated by the ‘second‐meal effect’, which describes how the glycaemic and insulinaemic responses to repeated carbohydrate ingestion are attenuated relative to an initial meal hours earlier (Hamman & Hirschman, 1919). This phenomenon was first observed using sequential oral glucose tolerance tests but has since been replicated with intravenous infusions (Szabo et al. 1969) and mixed macronutrient breakfasts relative to extended morning fasting (Gonzalez, 2014; Chowdhury et al. 2015, 2016b; Jakubowicz et al. 2017). Interestingly the availability of systemic glucose across the morning has been suggested as a possible determinant of physical activity levels in breakfast ‘consumers’ relative to ‘skippers’ (Betts et al. 2014; Chowdhury et al. 2016a ). Whilst the precise mechanisms underpinning the second‐meal effect remain the subject of current investigations (Lee et al. 2011; Edinburgh et al. 2017; Edinburgh et al. 2018), the study by Jakubowicz et al. (2017) supports that maintenance of rhythmic clock gene expression plays a role, since the expected pattern of core clock gene expression in leukocytes is disrupted when habitual breakfast consumers omit their usual morning meal.

Further to the acute metabolic effects of breakfast on the responses to subsequent meals later within the same day, recent research has also explored the longer‐term effects (i.e. 6 weeks) of regular daily breakfast consumption versus extended morning fasting on free‐living behavioural responses and any accumulated adaptation in metabolic control. In brief, complete omission of breakfast (i.e. zero energy intake until midday) every day for 6 weeks resulted in significantly lower physical activity thermogenesis than when a regular morning feeding was prescribed – a finding that has been replicated amongst both lean adults and those with obesity (Betts et al. 2014; Chowdhury et al. 2016 a). However, other than some evidence in these studies of more stable glycaemia and altered adipose tissue gene expression in lean individuals and improved insulin sensitivity in obese individuals (Gonzalez et al. 2018), there were no other effects of regular breakfast on markers of cardiometabolic health nor any metabolic adaptation (Chowdhury et al. 2019, 2018). (For a more detailed overview of this series of studies, see Betts et al. 2016.)

Intermittent fasting

Whilst skipping breakfast is often considered an unhealthy dietary approach (notwithstanding the lack of empirical support for that view), regularly omitting the same meal and/or restricting energy intake to the same set times each day (i.e. time restricted eating) may at least be conducive to the entrainment of endogenous rhythms to that consistently repeating feeding pattern. By contrast, numerous other contemporary approaches to intermittent fasting, often employed as a means to control body weight through weight loss or maintenance, can involve irregular or chaotic patterns of feeding and fasting within each 24 h period (Templeman et al. 2020), so are not easily anticipated by the circadian timing system and thus complicate effective metabolic regulation. Popular forms of intermittent fasting within this category include the 5:2 diet (fasting on two non‐consecutive days each week) and alternate day fasting (i.e. never feeding on consecutive days). Part of the challenge in understanding the potential effects of any diet based upon intermittent fasting is that the extended periods of complete energy restriction typically culminate in a net energy deficit and therefore weight loss. It therefore becomes difficult to determine whether any observed effects on cardiometabolic health, appetite regulation or other relevant outcomes are attributable to fasting per se or simply to the consequences of negative energy balance and reduced adipose tissue mass.

We recently conducted a randomised controlled trial in lean participants expressly to isolate the independent effects of intermittent fasting and net energy restriction (Templeman et al. 2021a ). This was achieved by having some participants impart a prescribed degree of energy restriction but without fasting (i.e. consuming 75% of usual energy intake at each regular meal), whilst others fasted completely every other 24 h but, critically, were re‐fed on the alternate days either to match the first group for net energy restriction (i.e. 50% more food than usual on fed days) or to replace the energy ‘missed’ through fasting altogether (i.e. 100% more food than usual on fed days). Prescribing additional food to minimise or even completely prevent weight loss is understandably not intended to reflect a diet that might be advocated in the real world, but this unusual approach does provide the required experimental design needed to understand the separate and combined effects of fasting and energy (im)balance.

Through the above approach it was possible to determine that standard daily dieting (i.e. without fasting) elicited almost 2 kg of weight loss over 3 weeks and, moreover, that almost all of that change in total body mass was attributable to reductions in body fat content. By contrast, imposing the same prescribed degree of energy restriction via alternate‐day fasting resulted in a similar (albeit slightly lower) rate of overall weight loss but this was accounted for in equal measure by reductions in both fat mass and fat‐free mass. Part of the explanation for this apparent difference in energy balance despite ostensibly similar reductions in energy intake is that energy expenditure is not constant but rather has the capacity to compensate for extended periods of fasting to preserve endogenous energy reserves. Specifically, consistent with the adaptive behavioural responses to breakfast omission described earlier, achieving an energy deficit via intermittent fasting can spontaneously inhibit physical activity energy expenditure (i.e. skeletal muscle force production; Westerterp, 2013; Ruddick‐Collins et al. 2020) to below habitual levels, whereas there was no such change in physical activity levels when the same degree of energy restriction was achieved without fasting (it remains to be seen whether similar behavioural responses occur in obese individuals). Nonetheless, unlike the previously described effect of breakfast omission, there was no difference between any of the interventions in relation to systemic indices of cardiometabolic health, gut hormones, or the expression of key genes in subcutaneous adipose tissue. Overall, the data reported in Templeman et al. (2021 a) further illustrate the complexity of metabolic regulation within the context of nutrient timing since the potential physiological consequences of intermittent fasting may depend upon the interaction between circadian rhythms and related compensatory responses to a modified feeding–fasting pattern.

Nocturnal interventions

Excepting the above rather extreme forms of prolonged fasting, most individuals remain in a permanently post‐prandial (fed) state for the entirety of daylight/waking hours and so the overnight/sleep phase typically coincides with the longest period of fasting in any given 24 h cycle (Ruge et al. 2009). According to the circadian timing system described earlier, this may reflect an entirely natural and properly synchronised alignment between the fed–fasted cycle and all other daily light–dark, wake–sleep and activity–rest cycles. However, it might also be reasoned that this extended period of nutritional withdrawal presents a possible opportunity for dietary intervention. For example, the ‘dawn phenomenon’ noted earlier highlights how blood glucose may be elevated upon waking, whereas the ‘second‐meal effect’ highlights how prior feeding can be employed to prime the system in preparation for subsequent meals; this begs questions such as whether a nocturnal pre‐load can be used to improve glycaemic control in response to breakfast. An initial investigation into such possibilities examined whether waking briefly at 04.00 h to consume a bolus of whey protein might improve metabolic control at breakfast; paradoxically, that nocturnal feeding intervention actually resulted in impaired glucose tolerance at breakfast, along with elevated lipid oxidation but no effect on appetite (Smith et al. 2021). This surprising finding may be partly attributable to the relatively large dose of protein, which was delivered at a time when an abundance of exogenous amino acids is neither required nor expected by the circadian timing system. Consequently, whilst nocturnal feeding presents a possible opportunity for nutritional intervention, it also is a useful paradigm through which we can further understand the relationship between misaligned eating and the increased risk of cardiometabolic disease.

In addition to balancing the potential benefits and apparent risks of applying nutritional interventions at night, it is also important to consider the indirect impact of interfering with habitual sleep patterns. Indeed, sleep appears to be inherently linked to metabolic regulation, obesity and associated comorbidities, with chronic sleep disorders exerting a potent negative effect on glycaemic control (Briancon‐Marjollet et al. 2015). For example, to begin with the more extreme model of total sleep deprivation (i.e. remaining awake for one or more nights), fasted glucose concentrations are progressively elevated after 24–120 h of sleeplessness (Kuhn et al. 1969; Vondra et al. 1981; Wehrens et al. 2010; Benedict et al. 2011). Post‐prandial metabolic control is even more profoundly affected by such models of total sleep restriction, with elevated glycaemic and insulinaemic responses and reduced insulin sensitivity clearly evident after a single night of complete nocturnal wakefulness (Kuhn et al. 1969; VanHelder et al. 1993; Wehrens et al. 2010; Benedict et al. 2011). Disrupted sleep may perturb next day metabolism through a multitude of proposed mechanisms; these include, but are not limited to alterations in brain glucose utilization and changes in hormonal secretion profile (Scheen et al. 1996), sympathetic nervous stimulation (Spiegel et al. 2004), and/or inflammation (Meier‐Ewert et al. 2004; Vgontzas et al. 2004).

Partial sleep deprivation (i.e. a shorter total sleep duration than usual) is a more common occurrence in the real world and can also perturb glycaemic control the following morning, with evidence of impaired glucose clearance and whole‐body insulin sensitivity after even a single night of limited sleep (Donga et al. 2010; Gonnissen et al. 2013; Wang et al. 2016; Sweeney et al. 2017). Sleep duration can be limited by simply going to bed later and/or getting up earlier or via sleep fragmentation. The latter refers to when sleep is intermittently disrupted by brief waking periods and has the potential to interrupt progression through the various stages of the sleep cycle even if total sleep duration is not substantially curtailed (Tasali et al. 2008). We tested the effect of fragmented sleep in our recent work but found post‐prandial glucose and insulin responses upon waking to be unaffected by having woken hourly throughout the prior 8‐h sleep opportunity (Smith et al. 2020). Interestingly, based on the reasoning that a strong coffee is a common remedy following a night of broken sleep, we also investigated the effects of caffeine within the context of the above experimental model. Consistent with the established effects of caffeine on insulin sensitivity independent of sleep deprivation (Robertson et al. 2015; Robertson et al. 2018), consuming a cup of coffee following a night of sleep fragmentation resulted in a ∼50% higher glycaemic response and ∼15% higher insulinaemic response at breakfast than either a night of uninterrupted sleep or a matched sleep fragmentation protocol without caffeine prior to breakfast (Smith et al. 2020). Further work is therefore needed to better understand whether the potential opportunity for nutritional intervention at night can be harnessed with minimal disruption of sleep patterns, circadian rhythms and next‐day metabolic responses.

Conclusion

Molecular clocks allow for temporal coordination between environmental, metabolic and behavioural cues. Meal patterns are a key element of this system and so considerations regarding nutrient timing should be incorporated into dietary guidelines alongside the conventional focus on nutrient quantity and nutrient quality. Research over the past decade has explored various aspects of nutrient timing and identified several promising approaches to human health improvement involving chrono‐nutrition. Further novel insight will be possible through examining the physiological responses of human participants over complete 24‐h monitoring cycles, including sequential meal tests, nocturnal feeding and with assessments under free‐living conditions.

Additional information

Competing interests

J.A.B. is an investigator on research grants funded by BBSRC, MRC, British Heart Foundation, Rare Disease Foundation, EU Hydration Institute, GlaxoSmithKline, Nestlé, Lucozade Ribena Suntory, ARLA foods and Kennis Centrum Suiker; has completed paid consultancy for PepsiCo, Kellogg's and SVGC; receives an annual stipend as Editor‐in Chief of International Journal of Sport Nutrition & Exercise Metabolism; and receives an annual honorarium as a member of the academic advisory board for the International Olympic Committee Diploma in Sports Nutrition.

Author contributions

Both authors contributed to the writing of this review. Both authors have read and approved the final version of this manuscript and agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. All persons designated as authors qualify for authorship, and all those who qualify for authorship are listed.

Funding

No funding was awarded for the production of this review article.

Supporting information

Peer Review History

Biography

Harry Smith (left) is a PhD student in the Centre for Nutrition, Exercise and Metabolism (CNEM) at the University of Bath. James Betts (right) is Professor of Metabolic Physiology and co‐director of CNEM at Bath. Their research focuses on the role of nutrient timing on metabolic regulation and human health.

graphic file with name TJP-600-1299-g004.gif

Edited by: Ian Forsythe & Javier Gonzalez

The peer review history is available in the Supporting Information section of this article (https://doi.org/10.1113/JP280756#support‐information‐section).

This review was an accepted presentation for the American College of Sports Medicine 2020 annual meeting “Novel dietary approaches to appetite regulation, health and performance” which was rescheduled for 2021.

This is an Editor's Choice article from the 15 March 2022 issue.

References

  1. Adam K & Oswald I (1981). Diurnal pattern of protein and energy metabolism in man: some doubts. Am J Clin Nutr 34, 1624–1628. [DOI] [PubMed] [Google Scholar]
  2. Akhtar RA, Reddy AB, Maywood ES, Clayton JD, King VM, Smith AG, Gant TW, Hastings MH & Kyriacou CP (2002). Circadian cycling of the mouse liver transcriptome, as revealed by cDNA microarray, is driven by the suprachiasmatic nucleus. Curr Biol 12, 540–550. [DOI] [PubMed] [Google Scholar]
  3. Albrecht U (2017). The circadian clock, metabolism and obesity. Obes Rev 18 25–33. [DOI] [PubMed] [Google Scholar]
  4. Andrews JL, Zhang X, McCarthy JJ, McDearmon EL, Hornberger TA, Russell B, Campbell KS, Arbogast S, Reid MB, Walker JR, Hogenesch JB, Takahashi JS & Esser KA (2010). CLOCK and BMAL1 regulate MyoD and are necessary for maintenance of skeletal muscle phenotype and function. Proc Natl Acad Sci U S A 107, 19090–19095. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Ang JE, Revell V, Mann A, Mantele S, Otway DT, Johnston JD, Thumser AE, Skene DJ & Raynaud F (2012). Identification of human plasma metabolites exhibiting time‐of‐day variation using an untargeted liquid chromatography‐mass spectrometry metabolomic approach. Chronobiol Int 29, 868–881. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Aparicio NJ, Puchulu FE, Gagliardino JJ, Ruiz M, Llorens JM, Ruiz J, Lamas A & De Miguel R (1974). Circadian variation of the blood glucose, plasma insulin and human growth hormone levels in response to an oral glucose load in normal subjects. Diabetes 23, 132–137. [DOI] [PubMed] [Google Scholar]
  7. Aschoff J (1954). Zeitgeber der tierischen Tagesperiodik. Naturwissenschaften 41, 49–56. [Google Scholar]
  8. Aschoff J & Pohl H (1978). Phase relations between a circadian rhythm and its zeitgeber within the range of entrainment. Naturwissenschaften 65, 80–84. [DOI] [PubMed] [Google Scholar]
  9. Asher G, Gatfield D, Stratmann M, Reinke H, Dibner C, Kreppel F, Mostoslavsky R, Alt FW & Schibler U (2008). SIRT1 regulates circadian clock gene expression through PER2 deacetylation. Cell 134, 317–328. [DOI] [PubMed] [Google Scholar]
  10. Baker IA & Jarrett RJ (1972). Diurnal variation in the blood‐sugar and plasma‐insulin response to tolbutamide. Lancet 2, 945–947. [DOI] [PubMed] [Google Scholar]
  11. Barattini P, Larsen KR, Moore JG & Dayton MT (1993). Circadian rhythm of pepsin efflux in the fasting rat stomach. Chronobiol Int 10, 403–409. [DOI] [PubMed] [Google Scholar]
  12. Beelen M, Tieland M, Gijsen AP, Vandereyt H, Kies AK, Kuipers H, Saris WH, Koopman R & van Loon LJ (2008). Coingestion of carbohydrate and protein hydrolysate stimulates muscle protein synthesis during exercise in young men, with no further increase during subsequent overnight recovery. J Nutr 138, 2198–2204. [DOI] [PubMed] [Google Scholar]
  13. Benedict C, Hallschmid M, Lassen A, Mahnke C, Schultes B, Schiöth HB, Born J & Lange T (2011). Acute sleep deprivation reduces energy expenditure in healthy men. Am J Clin Nutr 93, 1229–1236. [DOI] [PubMed] [Google Scholar]
  14. Berson DM (2003). Strange vision: ganglion cells as circadian photoreceptors. Trends Neurosci 26, 314–320. [DOI] [PubMed] [Google Scholar]
  15. Betts JA, Beelen M, Stokes KA, Saris WH & van Loon LJ (2011). Endocrine responses during overnight recovery from exercise: impact of nutrition and relationships with muscle protein synthesis. Int J Sport Nutr Exerc Metab 21, 398–409. [DOI] [PubMed] [Google Scholar]
  16. Betts JA, Chowdhury EA, Gonzalez JT, Richardson JD, Tsintzas K & Thompson D (2016). Is breakfast the most important meal of the day? Proc Nutr Soc 75, 464–474. [DOI] [PubMed] [Google Scholar]
  17. Betts JA, Richardson JD, Chowdhury EA, Holman GD, Tsintzas K & Thompson D (2014). The causal role of breakfast in energy balance and health: a randomized controlled trial in lean adults. Am J Clin Nutr 100, 539–547. [DOI] [PMC free article] [PubMed] [Google Scholar]
  18. Bo S, Fadda M, Castiglione A, Ciccone G, De Francesco A, Fedele D, Guggino A, Parasiliti Caprino M, Ferrara S, Vezio Boggio M, Mengozzi G, Ghigo E, Maccario M & Broglio F (2015). Is the timing of caloric intake associated with variation in diet‐induced thermogenesis and in the metabolic pattern? A randomized cross‐over study. Int J Obes 39, 1689–1695. [DOI] [PubMed] [Google Scholar]
  19. Boden G, Ruiz J, Urbain JL & Chen X (1996). Evidence for a circadian rhythm of insulin secretion. Am J Physiol 271, E246–E252. [DOI] [PubMed] [Google Scholar]
  20. Brebbia DR & Altshuler KZ (1965). Oxygen consumption rate and electroencephalographic stage of sleep. Science 150, 1621–1623. [DOI] [PubMed] [Google Scholar]
  21. Briancon‐Marjollet A, Weiszenstein M, Henri M, Thomas A, Godin‐Ribuot D & Polak J (2015). The impact of sleep disorders on glucose metabolism: endocrine and molecular mechanisms. Diabetol Metab Syndr 7, 25. [DOI] [PMC free article] [PubMed] [Google Scholar]
  22. Brown SA, Zumbrunn G, Fleury‐Olela F, Preitner N & Schibler U (2002). Rhythms of mammalian body temperature can sustain peripheral circadian clocks. Curr Biol 12, 1574–1583. [DOI] [PubMed] [Google Scholar]
  23. Buhr ED & Takahashi JS (2013). Molecular components of the mammalian circadian clock. Handb Exp Pharmacol, 3–27. [DOI] [PMC free article] [PubMed] [Google Scholar]
  24. Buhr ED, Yoo SH & Takahashi JS (2010). Temperature as a universal resetting cue for mammalian circadian oscillators. Science 330, 379–385. [DOI] [PMC free article] [PubMed] [Google Scholar]
  25. Cheung IN, Zee PC, Shalman D, Malkani RG, Kang J & Reid KJ (2016). Morning and evening blue‐enriched light exposure alters metabolic function in normal weight adults. PLoS One 11, e0155601. [DOI] [PMC free article] [PubMed] [Google Scholar]
  26. Chowdhury EA, Richardson JD, Gonzalez JT, Tsintzas K, Thompson D & Betts JA (2019). Six weeks of morning fasting causes little adaptation of metabolic or appetite responses to feeding in adults with obesity. Obesity 27, 813–821. [DOI] [PMC free article] [PubMed] [Google Scholar]
  27. Chowdhury EA, Richardson JD, Holman GD, Tsintzas K, Thompson D & Betts JA (2016a). The causal role of breakfast in energy balance and health: a randomized controlled trial in obese adults. Am J Clin Nutr 103, 747–756. [DOI] [PMC free article] [PubMed] [Google Scholar]
  28. Chowdhury EA, Richardson JD, Tsintzas K, Thompson D & Betts JA (2015). Carbohydrate‐rich breakfast attenuates glycaemic, insulinaemic and ghrelin response to ad libitum lunch relative to morning fasting in lean adults. Br J Nutr 114, 98–107. [DOI] [PMC free article] [PubMed] [Google Scholar]
  29. Chowdhury EA, Richardson JD, Tsintzas K, Thompson D & Betts JA (2016b). Effect of extended morning fasting upon ad libitum lunch intake and associated metabolic and hormonal responses in obese adults. Int J Obes 40, 305–311. [DOI] [PMC free article] [PubMed] [Google Scholar]
  30. Chowdhury EA, Richardson JD, Tsintzas K, Thompson D & Betts JA (2018). Postprandial metabolism and appetite do not differ between lean adults that eat breakfast or morning fast for 6 weeks. J Nutr 148, 13–21. [DOI] [PMC free article] [PubMed] [Google Scholar]
  31. Christou S, Wehrens SMT, Isherwood C, Moller‐Levet CS, Wu H, Revell VL, Bucca G, Skene DJ, Laing EE, Archer SN & Johnston JD (2019). Circadian regulation in human white adipose tissue revealed by transcriptome and metabolic network analysis. Sci Rep 9, 2641. [DOI] [PMC free article] [PubMed] [Google Scholar]
  32. Cook DN, Kang HS, Jetten AM (2015). Retinoic acid‐related orphan receptors (RORs): regulatory functions in immunity, development, circadian rhythm, and metabolism. Nucl Receptor Res 2, 10.11131/2015/101185 [DOI] [PMC free article] [PubMed] [Google Scholar]
  33. Crosby P, Hamnett R, Putker M, Hoyle NP, Reed M, Karam CJ, Maywood ES, Stangherlin A, Chesham JE, Hayter EA, Rosenbrier‐Ribeiro L, Newham P, Clevers H, Bechtold DA & O'Neill JS (2019). Insulin/IGF‐1 drives PERIOD synthesis to entrain circadian rhythms with feeding time. Cell 177, 896–909.e20. [DOI] [PMC free article] [PubMed] [Google Scholar]
  34. Dallmann R, Viola AU, Tarokh L, Cajochen C & Brown SA (2012). The human circadian metabolome. Proc Natl Acad Sci U S A 109, 2625–2629. [DOI] [PMC free article] [PubMed] [Google Scholar]
  35. Dierickx P, Van Laake LW & Geijsen N (2018). Circadian clocks: from stem cells to tissue homeostasis and regeneration. EMBO Rep 19, 18–28. [DOI] [PMC free article] [PubMed] [Google Scholar]
  36. Donga E, van Dijk M, van Dijk JG, Biermasz NR, Lammers GJ, van Kralingen KW, Corssmit EP & Romijn JA (2010). A single night of partial sleep deprivation induces insulin resistance in multiple metabolic pathways in healthy subjects. J Clin Endocrinol Metab 95, 2963–2968. [DOI] [PubMed] [Google Scholar]
  37. Duffy JF & Czeisler CA (2009). Effect of light on human circadian physiology. Sleep Med Clin 4, 165–177. [DOI] [PMC free article] [PubMed] [Google Scholar]
  38. Edinburgh RM, Betts JA, Burns SF & Gonzalez JT (2017). Concordant and divergent strategies to improve postprandial glucose and lipid metabolism. Nutrition Bulletin 42, 113–122. [Google Scholar]
  39. Edinburgh RM, Hengist A, Smith HA, Travers RL, Koumanov F, Betts JA, Thompson D, Walhin JP, Wallis GA, Hamilton DL, Stevenson EJ, Tipton KD & Gonzalez JT (2018). Preexercise breakfast ingestion versus extended overnight fasting increases postprandial glucose flux after exercise in healthy men. Am J Physiol Endocrinol Metab 315, E1062–E1074. [DOI] [PMC free article] [PubMed] [Google Scholar]
  40. Edwards B, Waterhouse J, Reilly T & Atkinson G (2002). A comparison of the suitabilities of rectal, gut, and insulated axilla temperatures for measurement of the circadian rhythm of core temperature in field studies. Chronobiol Int 19, 579–597. [DOI] [PubMed] [Google Scholar]
  41. Feigin RD, Klainer AS & Beisel WR (1967). Circadian periodicity of blood amino‐acids in adult men. Nature 215, 512–514. [DOI] [PubMed] [Google Scholar]
  42. Feigin RD, Klainer AS & Beisel WR (1968). Factors affecting circadian periodicity of blood amino acids in man. Metabolism 17, 764–775. [DOI] [PubMed] [Google Scholar]
  43. Figueiro MG, Plitnick B & Rea MS (2012). Light modulates leptin and ghrelin in sleep‐restricted adults. Int J Endocrinol 2012, 530726. [DOI] [PMC free article] [PubMed] [Google Scholar]
  44. Fiorucci S, Distrutti E, Di Matteo F, Brunori P, Santucci L, Mallozzi E, Bigazzi U & Morelli A (1995). Circadian variations in gastric acid and pepsin secretion and intragastric bile acid in patients with reflux esophagitis and in healthy controls. Am J Gastroenterol 90, 270–276. [PubMed] [Google Scholar]
  45. Flanagan A, Bechtold DA, Pot GK & Johnston JD (2021). Chrono‐nutrition: from molecular and neuronal mechanisms to human epidemiology and timed feeding patterns. J Neurochem 157, 53–72. [DOI] [PubMed] [Google Scholar]
  46. Fontvieille AM, Rising R, Spraul M, Larson DE & Ravussin E (1994). Relationship between sleep stages and metabolic rate in humans. Am J Physiol 267, E732–E737. [DOI] [PubMed] [Google Scholar]
  47. Frayn K (2019). Human Metabolism: A Regulatory Perspective. Wiley‐Blackwell, Hoboken, NJ. [Google Scholar]
  48. Galindo Munoz JS, Jimenez Rodriguez D & Hernandez Morante JJ (2015). Diurnal rhythms of plasma GLP‐1 levels in normal and overweight/obese subjects: lack of effect of weight loss. J Physiol Biochem 71, 17–28. [DOI] [PubMed] [Google Scholar]
  49. Garlick PJ, Clugston GA, Swick RW & Waterlow JC (1980). Diurnal pattern of protein and energy metabolism in man. Am J Clin Nutr 33, 1983–1986. [DOI] [PubMed] [Google Scholar]
  50. Gonnissen HK, Hursel R, Rutters F, Martens EA & Westerterp‐Plantenga MS (2013). Effects of sleep fragmentation on appetite and related hormone concentrations over 24 h in healthy men. Br J Nutr 109, 748–756. [DOI] [PubMed] [Google Scholar]
  51. Gonzalez JT (2014). Paradoxical second‐meal phenomenon in the acute postexercise period. Nutrition 30, 961–967. [DOI] [PubMed] [Google Scholar]
  52. Gonzalez JT, Richardson JD, Chowdhury EA, Koumanov F, Holman GD, Cooper S, Thompson D, Tsintzas K & Betts JA (2018). Molecular adaptations of adipose tissue to 6 weeks of morning fasting vs. daily breakfast consumption in lean and obese adults. J Physiol 596, 609–622. [DOI] [PMC free article] [PubMed] [Google Scholar]
  53. Grant LK, Ftouni S, Nijagal B, De Souza DP, Tull D, McConville MJ, Rajaratnam SMW, Lockley SW & Anderson C (2019). Circadian and wake‐dependent changes in human plasma polar metabolites during prolonged wakefulness: a preliminary analysis. Sci Rep 9, 4428. [DOI] [PMC free article] [PubMed] [Google Scholar]
  54. Grimaldi B, Bellet MM, Katada S, Astarita G, Hirayama J, Amin RH, Granneman JG, Piomelli D, Leff T & Sassone‐Corsi P (2010). PER2 controls lipid metabolism by direct regulation of PPARγ. Cell Metab 12, 509–520. [DOI] [PMC free article] [PubMed] [Google Scholar]
  55. Gu C, Brereton N, Schweitzer A, Cotter M, Duan D, Børsheim E, Wolfe RR, Pham LV, Polotsky VY & Jun JC (2020). Metabolic effects of late dinner in healthy volunteers—A randomized crossover clinical trial. J Clin Endocrinol Metab 105, 2789–2802. [DOI] [PMC free article] [PubMed] [Google Scholar]
  56. Guillaumond F, Dardente H, Giguère V & Cermakian N (2005). Differential control of Bmal1 circadian transcription by REV‐ERB and ROR nuclear receptors. J Biol Rhythms 20, 391–403. [DOI] [PubMed] [Google Scholar]
  57. Guo B, Chatterjee S, Li L, Kim JM, Lee J, Yechoor VK, Minze LJ, Hsueh W & Ma K (2012). The clock gene, brain and muscle Arnt‐like 1, regulates adipogenesis via Wnt signaling pathway. FASEB J 26, 3453–3463. [DOI] [PMC free article] [PubMed] [Google Scholar]
  58. Hamman L & Hirschman I (1919). Studies on blood sugar. Effects upon the blood sugar of the repeated ingestion of glucose. Johns Hopkins Hospital Bull 344, 306–308. [Google Scholar]
  59. Hao H, Allen DL & Hardin PE (1997). A circadian enhancer mediates PER‐dependent mRNA cycling in Drosophila melanogaster. Mol Cell Biol 17, 3687–3693. [DOI] [PMC free article] [PubMed] [Google Scholar]
  60. Haskell EH, Palca JW, Walker JM, Berger RJ & Heller HC (1981). Metabolism and thermoregulation during stages of sleep in humans exposed to heat and cold. J Appl Physiol 51, 948–954. [DOI] [PubMed] [Google Scholar]
  61. Held NM, Wefers J, van Weeghel M, Daemen S, Hansen J, Vaz FM, van Moorsel D, Hesselink MKC, Houtkooper RH & Schrauwen P (2020). Skeletal muscle in healthy humans exhibits a day‐night rhythm in lipid metabolism. Mol Metab 37, 100989. [DOI] [PMC free article] [PubMed] [Google Scholar]
  62. Hill BR, De Souza MJ & Williams NI (2011). Characterization of the diurnal rhythm of peptide YY and its association with energy balance parameters in normal‐weight premenopausal women. Am J Physiol Endocrinol Metab 301, E409–E415. [DOI] [PMC free article] [PubMed] [Google Scholar]
  63. Ikeda Y, Kamagata M, Hirao M, Yasuda S, Iwami S, Sasaki H, Tsubosaka M, Hattori Y, Todoh A, Tamura K, Shiga K, Ohtsu T & Shibata S (2018). Glucagon and/or IGF‐1 production regulates resetting of the liver circadian clock in response to a protein or amino acid‐only diet. EBioMedicine 28, 210–224. [DOI] [PMC free article] [PubMed] [Google Scholar]
  64. Jagannath A, Taylor L, Wakaf Z, Vasudevan SR & Foster RG (2017). The genetics of circadian rhythms, sleep and health. Hum Mol Genet 26, R128–R138. [DOI] [PMC free article] [PubMed] [Google Scholar]
  65. Jakubowicz D, Wainstein J, Landau Z, Raz I, Ahren B, Chapnik N, Ganz T, Menaged M, Barnea M, Bar‐Dayan Y & Froy O (2017). Influences of breakfast on clock gene expression and postprandial glycemia in healthy individuals and individuals with diabetes: a randomized clinical trial. Diabetes Care 40, 1573–1579. [DOI] [PubMed] [Google Scholar]
  66. Jansen FM, van Kollenburg GH, Kamphuis CBM, Pierik FH & Ettema DF (2018). Hour‐by‐hour physical activity patterns of adults aged 45–65 years: a cross‐sectional study. J Public Health 40, 787–796. [DOI] [PMC free article] [PubMed] [Google Scholar]
  67. Johns CE, Newton JL, Westley BR & May FE (2006). Human pancreatic polypeptide has a marked diurnal rhythm that is affected by ageing and is associated with the gastric TFF2 circadian rhythm. Peptides 27, 1341–1348. [DOI] [PubMed] [Google Scholar]
  68. Jung CM, Melanson EL, Frydendall EJ, Perreault L, Eckel RH & Wright KP (2011). Energy expenditure during sleep, sleep deprivation and sleep following sleep deprivation in adult humans. J Physiol 589, 235–244. [DOI] [PMC free article] [PubMed] [Google Scholar]
  69. Kelu JJ, Pipalia TG & Hughes SM (2020). Circadian regulation of muscle growth independent of locomotor activity. Proc Natl Acad Sci U S A 117, 31208–31218. [DOI] [PMC free article] [PubMed] [Google Scholar]
  70. Ko CH & Takahashi JS (2006). Molecular components of the mammalian circadian clock. Hum Mol Genet 15(suppl_2), R271–R277. [DOI] [PubMed] [Google Scholar]
  71. Krauchi K & Wirz‐Justice A (1994). Circadian rhythm of heat production, heart rate, and skin and core temperature under unmasking conditions in men. Am J Physiol 267, R819–R829. [DOI] [PubMed] [Google Scholar]
  72. Kuhn E, Brodan V, Brodanová M & Rysánek K (1969). Metabolic reflection of sleep deprivation. Act Nerv Super 11, 165–174. [PubMed] [Google Scholar]
  73. Kwon I, Lee J, Chang SH, Jung NC, Lee BJ, Son GH, Kim K & Lee KH (2006). BMAL1 shuttling controls transactivation and degradation of the CLOCK/BMAL1 heterodimer. Mol Cell Biol 26, 7318–7330. [DOI] [PMC free article] [PubMed] [Google Scholar]
  74. la Fleur SE, Kalsbeek A, Wortel J, van der Vliet J & Buijs RM (2001). Role for the pineal and melatonin in glucose homeostasis: pinealectomy increases night‐time glucose concentrations. J Neuroendocrinol 13, 1025–1032. [DOI] [PubMed] [Google Scholar]
  75. Lamia KA, Sachdeva UM, DiTacchio L, Williams EC, Alvarez JG, Egan DF, Vasquez DS, Juguilon H, Panda S, Shaw RJ, Thompson CB & Evans RM (2009). AMPK regulates the circadian clock by cryptochrome phosphorylation and degradation. Science 326, 437–440. [DOI] [PMC free article] [PubMed] [Google Scholar]
  76. Lee A, Ader M, Bray GA & Bergman RN (1992). Diurnal variation in glucose tolerance. Cyclic suppression of insulin action and insulin secretion in normal‐weight, but not obese, subjects. Diabetes 41, 750–759. [DOI] [PubMed] [Google Scholar]
  77. Lee SH, Tura A, Mari A, Ko SH, Kwon HS, Song KH, Yoon KH, Lee KW & Ahn YB (2011). Potentiation of the early‐phase insulin response by a prior meal contributes to the second‐meal phenomenon in type 2 diabetes. Am J Physiol Endocrinol Metab 301, E984–E990. [DOI] [PubMed] [Google Scholar]
  78. Leproult R, Holmbäck U & Van Cauter E (2014). Circadian misalignment augments markers of insulin resistance and inflammation, independently of sleep loss. Diabetes 63, 1860–1869. [DOI] [PMC free article] [PubMed] [Google Scholar]
  79. Leung GKW, Huggins CE & Bonham MP (2019). Effect of meal timing on postprandial glucose responses to a low glycemic index meal: a crossover trial in healthy volunteers. Clin Nutr 38, 465–471. [DOI] [PubMed] [Google Scholar]
  80. Lewy AJ, Cutler NL & Sack RL (1999). The endogenous melatonin profile as a marker for circadian phase position. J Biol Rhythms 14, 227–236. [DOI] [PubMed] [Google Scholar]
  81. Maddison R, Hoorn SV, Jiang Y, Mhurchu CN, Exeter D, Dorey E, Bullen C, Utter J, Schaaf D & Turley M (2009). The environment and physical activity: the influence of psychosocial, perceived and built environmental factors. Int J Behav Nutr Phys Act 6, 19. [DOI] [PMC free article] [PubMed] [Google Scholar]
  82. Marrino P, Gavish D, Shafrir E & Eisenberg S (1987). Diurnal variations of plasma lipids, tissue and plasma lipoprotein lipase, and VLDL secretion rates in the rat. A model for studies of VLDL metabolism. Biochim Biophys Acta 920, 277–284. [DOI] [PubMed] [Google Scholar]
  83. Mazzoccoli G, Pazienza V & Vinciguerra M (2012). Clock genes and clock‐controlled genes in the regulation of metabolic rhythms. Chronobiol Int 29, 227–251. [DOI] [PubMed] [Google Scholar]
  84. McGinnis GR & Young ME (2016). Circadian regulation of metabolic homeostasis: causes and consequences. Nat Sci Sleep 8, 163–180. [DOI] [PMC free article] [PubMed] [Google Scholar]
  85. Meier‐Ewert HK, Ridker PM, Rifai N, Regan MM, Price NJ, Dinges DF & Mullington JM (2004). Effect of sleep loss on C‐reactive protein, an inflammatory marker of cardiovascular risk. J Am Coll Cardiol 43, 678–683. [DOI] [PubMed] [Google Scholar]
  86. Mohawk JA, Green CB & Takahashi JS (2012). Central and peripheral circadian clocks in mammals. Annu Rev Neurosci 35, 445–462. [DOI] [PMC free article] [PubMed] [Google Scholar]
  87. Morgan LM, Aspostolakou F, Wright J & Gama R (1999). Diurnal variations in peripheral insulin resistance and plasma non‐esterified fatty acid concentrations: a possible link? Ann Clin Biochem 36, 447–450. [DOI] [PubMed] [Google Scholar]
  88. Morris CJ, Garcia JI, Myers S, Yang JN, Trienekens N & Scheer FA (2015a). The human circadian system has a dominating role in causing the morning/evening difference in diet‐induced thermogenesis. Obesity 23, 2053–2058. [DOI] [PMC free article] [PubMed] [Google Scholar]
  89. Morris CJ, Yang JN, Garcia JI, Myers S, Bozzi I, Wang W, Buxton OM, Shea SA & Scheer FA (2015b). Endogenous circadian system and circadian misalignment impact glucose tolerance via separate mechanisms in humans. Proc Natl Acad Sci U S A 112, E2225–E2234. [DOI] [PMC free article] [PubMed] [Google Scholar]
  90. Mukherji A, Kobiita A & Chambon P (2015). Shifting the feeding of mice to the rest phase creates metabolic alterations, which, on their own, shift the peripheral circadian clocks by 12 hours. Proc Natl Acad Sci U S A 112, E6683–E6690. [DOI] [PMC free article] [PubMed] [Google Scholar]
  91. NHANES (2016). What We Eat in America, NHANES 2015–2016. https://www.ars.usda.gov/northeast‐area/beltsville‐md‐bhnrc/beltsville‐human‐nutrition‐research‐center/food‐surveys‐research‐group/docs/wweianhanes‐overview/
  92. Otway DT, Mantele S, Bretschneider S, Wright J, Trayhurn P, Skene DJ, Robertson MD & Johnston JD (2011). Rhythmic diurnal gene expression in human adipose tissue from individuals who are lean, overweight, and type 2 diabetic. Diabetes 60, 1577–1581. [DOI] [PMC free article] [PubMed] [Google Scholar]
  93. Palca JW, Walker JM & Berger RJ (1986). Thermoregulation, metabolism, and stages of sleep in cold‐exposed men. J Appl Physiol 61, 940–947. [DOI] [PubMed] [Google Scholar]
  94. Pan X & Hussain MM (2007). Diurnal regulation of microsomal triglyceride transfer protein and plasma lipid levels. J Biol Chem 282, 24707–24719. [DOI] [PubMed] [Google Scholar]
  95. Pan X, Jiang XC & Hussain MM (2013). Impaired cholesterol metabolism and enhanced atherosclerosis in clock mutant mice. Circulation 128, 1758–1769. [DOI] [PMC free article] [PubMed] [Google Scholar]
  96. Paschos GK, Ibrahim S, Song WL, Kunieda T, Grant G, Reyes TM, Bradfield CA, Vaughan CH, Eiden M, Masoodi M, Griffin JL, Wang F, Lawson JA & Fitzgerald GA (2012). Obesity in mice with adipocyte‐specific deletion of clock component Arntl. Nat Med 18, 1768–1777. [DOI] [PMC free article] [PubMed] [Google Scholar]
  97. Perrin L, Loizides‐Mangold U, Chanon S, Gobet C, Hulo N, Isenegger L, Weger BD, Migliavacca E, Charpagne A, Betts JA, Walhin JP, Templeman I, Stokes K, Thompson D, Tsintzas K, Robert M, Howald C, Riezman H, Feige JN, Karagounis LG, Johnston JD, Dermitzakis ET, Gachon F, Lefai E & Dibner C (2018). Transcriptomic analyses reveal rhythmic and CLOCK‐driven pathways in human skeletal muscle. Elife 16, 34114. [DOI] [PMC free article] [PubMed] [Google Scholar]
  98. Ptitsyn AA, Zvonic S, Conrad SA, Scott LK, Mynatt RL & Gimble JM (2006). Circadian clocks are resounding in peripheral tissues. PLoS Comput Biol 2, e16. [DOI] [PMC free article] [PubMed] [Google Scholar]
  99. Qandeel HG, Alonso F, Hernandez DJ, Duenes JA, Zheng Y, Scow JS & Sarr MG (2009a). Role of vagal innervation in diurnal rhythm of intestinal peptide transporter 1 (PEPT1). J Gastrointest Surg 13, 1976–1985. [DOI] [PMC free article] [PubMed] [Google Scholar]
  100. Qandeel HG, Duenes JA, Zheng Y & Sarr MG (2009b). Diurnal expression and function of peptide transporter 1 (PEPT1). J Surg Res 156, 123–128. [DOI] [PMC free article] [PubMed] [Google Scholar]
  101. Qian J & Scheer F (2016). Circadian system and glucose metabolism: implications for physiology and disease. Trends Endocrinol Metab 27, 282–293. [DOI] [PMC free article] [PubMed] [Google Scholar]
  102. Radziuk J & Pye S (2006). Diurnal rhythm in endogenous glucose production is a major contributor to fasting hyperglycaemia in type 2 diabetes. Suprachiasmatic deficit or limit cycle behaviour? Diabetologia 49, 1619–1628. [DOI] [PubMed] [Google Scholar]
  103. Robertson TM, Clifford MN, Penson S, Chope G & Robertson MD (2015). A single serving of caffeinated coffee impairs postprandial glucose metabolism in overweight men. Br J Nutr 114, 1218–1225. [DOI] [PubMed] [Google Scholar]
  104. Robertson TM, Clifford MN, Penson S, Williams P & Robertson MD (2018). Postprandial glycaemic and lipaemic responses to chronic coffee consumption may be modulated by CYP1A2 polymorphisms. Br J Nutr 119, 792–800. [DOI] [PubMed] [Google Scholar]
  105. Robles MS, Cox J & Mann M (2014). In‐vivo quantitative proteomics reveals a key contribution of post‐transcriptional mechanisms to the circadian regulation of liver metabolism. PLoS Genet 10, e1004047. [DOI] [PMC free article] [PubMed] [Google Scholar]
  106. Romon M, Edme JL, Boulenguez C, Lescroart JL & Frimat P (1993). Circadian variation of diet‐induced thermogenesis. Am J Clin Nutr 57, 476–480. [DOI] [PubMed] [Google Scholar]
  107. Ruddick‐Collins LC, Flanagan A, Johnston JD, Morgan PJ & Johnstone AM (2021). Circadian rhythms in resting metabolic rate account for apparent daily rhythms in thermic effect of food. J Clin Endocrinol Metab (in press; DOI: 10.1210/clinem/dgab654. [DOI] [PMC free article] [PubMed] [Google Scholar]
  108. Ruddick‐Collins LC, Morgan PJ & Johnstone AM (2020). Mealtime: a circadian disruptor and determinant of energy balance? J Neuroendocrinol 32, e12886. [DOI] [PubMed] [Google Scholar]
  109. Ruge T, Hodson L, Cheeseman J, Dennis AL, Fielding BA, Humphreys SM, Frayn KN & Karpe F (2009). Fasted to fed trafficking of fatty acids in human adipose tissue reveals a novel regulatory step for enhanced fat storage. J Clin Endocrinol Metab 94, 1781–1788. [DOI] [PubMed] [Google Scholar]
  110. Rynders CA, Morton SJ, Bessesen DH, Wright KP Jr & Broussard JL (2020). Circadian Rhythm of substrate oxidation and hormonal regulators of energy balance. Obesity 28 S104–S113. [DOI] [PMC free article] [PubMed] [Google Scholar]
  111. Saad A, Dalla Man C, Nandy DK, Levine JA, Bharucha AE, Rizza RA, Basu R, Carter RE, Cobelli C, Kudva YC & Basu A (2012). Diurnal pattern to insulin secretion and insulin action in healthy individuals. Diabetes 61, 2691–2700. [DOI] [PMC free article] [PubMed] [Google Scholar]
  112. Sahar S & Sassone‐Corsi P (2012). Regulation of metabolism: the circadian clock dictates the time. Trends Endocrinol Metab 23, 1–8. [DOI] [PMC free article] [PubMed] [Google Scholar]
  113. Sargent C, Zhou X, Matthews RW, Darwent D & Roach GD (2016). Daily rhythms of hunger and satiety in healthy men during one week of sleep restriction and circadian misalignment. Int J Environ Res Public Health 13, 170. [DOI] [PMC free article] [PubMed] [Google Scholar]
  114. Sartini C, Wannamethee SG, Iliffe S, Morris RW, Ash S, Lennon L, Whincup PH & Jefferis BJ (2015). Diurnal patterns of objectively measured physical activity and sedentary behaviour in older men. BMC Public Health 15, 609. [DOI] [PMC free article] [PubMed] [Google Scholar]
  115. Scheen AJ, Byrne MM, Plat L, Leproult R & Van Cauter E (1996). Relationships between sleep quality and glucose regulation in normal humans. Am J Physiol 271, E261–E270. [DOI] [PubMed] [Google Scholar]
  116. Scheer FA, Morris CJ & Shea SA (2013). The internal circadian clock increases hunger and appetite in the evening independent of food intake and other behaviors. Obesity 21, 421–423. [DOI] [PMC free article] [PubMed] [Google Scholar]
  117. Schoeller DA, Cella LK, Sinha MK & Caro JF (1997). Entrainment of the diurnal rhythm of plasma leptin to meal timing. J Clin Invest 100, 1882–1887. [DOI] [PMC free article] [PubMed] [Google Scholar]
  118. Shimba S, Ogawa T, Hitosugi S, Ichihashi Y, Nakadaira Y, Kobayashi M, Tezuka M, Kosuge Y, Ishige K, Ito Y, Komiyama K, Okamatsu‐Ogura Y, Kimura K & Saito M (2011). Deficient of a clock gene, brain and muscle Arnt‐like protein‐1 (BMAL1), induces dyslipidemia and ectopic fat formation. PLoS One 6, e25231. [DOI] [PMC free article] [PubMed] [Google Scholar]
  119. Simon C, Brandenberger G, Saini J, Ehrhart J & Follenius M (1994). Slow oscillations of plasma glucose and insulin secretion rate are amplified during sleep in humans under continuous enteral nutrition. Sleep 17, 333–338. [DOI] [PubMed] [Google Scholar]
  120. Slominski AT, Zmijewski MA, Skobowiat C, Zbytek B, Slominski RM & Steketee JD (2012). Sensing the environment: regulation of local and global homeostasis by the skin's neuroendocrine system. Adv Anat Embryol Cell Biol 212, v, vii, 1–115. [DOI] [PMC free article] [PubMed] [Google Scholar]
  121. Smith ES, Adama E, Clayton K, Holbrey J, Palubiski G, Smith HA, Gonzalez JT & Betts JA (2021). Nocturnal whey protein ingestion impairs post‐prandial glucose tolerance at breakfast. Br J Nutr 125, 669–677. [DOI] [PubMed] [Google Scholar]
  122. Smith HA, Hengist A, Thomas J, Walhin JP, Heath P, Perkin O, Chen YC, Gonzalez JT & Betts JA (2020). Glucose control upon waking is unaffected by hourly sleep fragmentation during the night, but is impaired by morning caffeinated coffee. Br J Nutr 124, 1114–1120. [DOI] [PubMed] [Google Scholar]
  123. Spengler CM, Czeisler CA & Shea SA (2000). An endogenous circadian rhythm of respiratory control in humans. J Physiol 3, 683–694. [DOI] [PMC free article] [PubMed] [Google Scholar]
  124. Spiegel K, Leproult R, L'Hermite‐Balériaux M, Copinschi G, Penev PD & Van Cauter E (2004). Leptin levels are dependent on sleep duration: relationships with sympathovagal balance, carbohydrate regulation, cortisol, and thyrotropin. J Clin Endocrinol Metab 89, 5762–5771. [DOI] [PubMed] [Google Scholar]
  125. Sprenger RR, Hermansson M, Neess D, Becciolini LS, Sørensen SB, Fagerberg R, Ecker J, Liebisch G, Jensen ON, Vance DE, Færgeman NJ, Klemm RW & Ejsing CS (2021). Lipid molecular timeline profiling reveals diurnal crosstalk between the liver and circulation. Cell Rep 34, 108710. [DOI] [PubMed] [Google Scholar]
  126. St John PC, Hirota T, Kay SA & Doyle FJ 3rd ( 2014). Spatiotemporal separation of PER and CRY posttranslational regulation in the mammalian circadian clock. Proc Natl Acad Sci U S A 111, 2040–2045. [DOI] [PMC free article] [PubMed] [Google Scholar]
  127. Sun X, Dang F, Zhang D, Yuan Y, Zhang C, Wu Y, Wang Y & Liu Y (2015). Glucagon‐CREB/CRTC2 signaling cascade regulates hepatic BMAL1 protein. J Biol Chem 290, 2189–2197. [DOI] [PMC free article] [PubMed] [Google Scholar]
  128. Sweeney EL, Jeromson S, Hamilton DL, Brooks NE & Walshe IH (2017). Skeletal muscle insulin signaling and whole‐body glucose metabolism following acute sleep restriction in healthy males. Physiol Rep 5, e13498. [DOI] [PMC free article] [PubMed] [Google Scholar]
  129. Szabo AJ, Maier JJ, Szabo O & Camerini‐Davalos RA (1969). Improved glucose disappearance following repeated glucose administration. Serum insulin growth hormone and free fatty acid levels during the Staub‐Traugott effect. Diabetes 18, 232–237. [DOI] [PubMed] [Google Scholar]
  130. Tahara Y, Hirao A, Moriya T, Kudo T & Shibata S (2010). Effects of medial hypothalamic lesions on feeding‐induced entrainment of locomotor activity and liver Per2 expression in Per2::luc mice. J Biol Rhythms 25, 9–18. [DOI] [PubMed] [Google Scholar]
  131. Tanaka Y, Ogata H, Kayaba M, Ando A, Park I, Yajima K, Araki A, Suzuki C, Osumi H, Zhang S, Ishihara A, Takahashi K, Shoda J, Nabekura Y, Satoh M & Tokuyama K (2020). Effect of a single bout of exercise on clock gene expression in human leukocyte. J Appl Physiol 128, 847–854. [DOI] [PubMed] [Google Scholar]
  132. Tasali E, Leproult R, Ehrmann DA & Van Cauter E (2008). Slow‐wave sleep and the risk of type 2 diabetes in humans. Proc Natl Acad Sci U S A 105, 1044–1049. [DOI] [PMC free article] [PubMed] [Google Scholar]
  133. Templeman I, Smith HA, Chowdhury E, Chen YC, Carroll H, Johnson‐Bonson D, Hengist A, Smith R, Creighton J, Clayton D, Varley I, Karagounis LG, Wilhelmsen A, Tsintzas K, Reeves S, Walhin JP, Gonzalez JT, Thompson D & Betts JA (2021a). A randomized controlled trial to isolate the effects of fasting and energy restriction on weight loss and metabolic health in lean adults. Sci Transl Med 13, eabd8034. [DOI] [PubMed] [Google Scholar]
  134. Templeman I, Smith HA, Walhin JP, Middleton B, Gonzalez JT, Karagounis LG, Johnston JD & Betts JA (2021b). Unacylated ghrelin, leptin, and appetite display diurnal rhythmicity in lean adults. J Appl Physiol 130, 1534–1543. [DOI] [PubMed] [Google Scholar]
  135. Templeman I, Gonzalez J, Thompson D & Betts J (2020). The role of intermittent fasting and meal timing in weight management and metabolic health. Proc Nutr Soc 79, 76–87. [DOI] [PubMed] [Google Scholar]
  136. Tuvia N, Pivovarova‐Ramich O, Murahovschi V, Lück S, Grudziecki A, Ost AC, Kruse M, Nikiforova VJ, Osterhoff M, Gottmann P, Gögebakan Ö, Sticht C, Gretz N, Schupp M, Schürmann A, Rudovich N, Pfeiffer AFH & Kramer A (2021). Insulin directly regulates the circadian clock in adipose tissue. Diabetes 70, 1985–1999. [DOI] [PubMed] [Google Scholar]
  137. Van Cauter E, Desir D, Decoster C, Fery F & Balasse EO (1989). Nocturnal decrease in glucose tolerance during constant glucose infusion. J Clin Endocrinol Metab 69, 604–611. [DOI] [PubMed] [Google Scholar]
  138. Van Cauter E, Polonsky KS & Scheen AJ (1997). Roles of circadian rhythmicity and sleep in human glucose regulation. Endocr Rev 18, 716–738. [DOI] [PubMed] [Google Scholar]
  139. Van Cauter E, Shapiro ET, Tillil H & Polonsky KS (1992). Circadian modulation of glucose and insulin responses to meals: relationship to cortisol rhythm. Am J Physiol 262, E467–E475. [DOI] [PubMed] [Google Scholar]
  140. VanHelder T, Symons JD & Radomski MW (1993). Effects of sleep deprivation and exercise on glucose tolerance. Aviat Space Environ Med 64, 487–492. [PubMed] [Google Scholar]
  141. van Moorsel D, Hansen J, Havekes B, Scheer F, Jorgensen JA, Hoeks J, Schrauwen‐Hinderling VB, Duez H, Lefebvre P, Schaper NC, Hesselink MKC, Staels B & Schrauwen P (2016). Demonstration of a day‐night rhythm in human skeletal muscle oxidative capacity. Mol Metab 5, 635–645. [DOI] [PMC free article] [PubMed] [Google Scholar]
  142. Vgontzas AN, Zoumakis E, Bixler EO, Lin HM, Follett H, Kales A & Chrousos GP (2004). Adverse effects of modest sleep restriction on sleepiness, performance, and inflammatory cytokines. J Clin Endocrinol Metab 89, 2119–2126. [DOI] [PubMed] [Google Scholar]
  143. Vollmers C, Gill S, DiTacchio L, Pulivarthy SR, Le HD & Panda S (2009). Time of feeding and the intrinsic circadian clock drive rhythms in hepatic gene expression. Proc Natl Acad Sci U S A 106, 21453–21458. [DOI] [PMC free article] [PubMed] [Google Scholar]
  144. Vondra K, Brodan V, Bass A, Kuhn E, Teisinger J, Andĕl M & Veselková A (1981). Effects of sleep deprivation on the activity of selected metabolic enzymes in skeletal muscle. Eur J Appl Physiol Occup Physiol 47, 41–46. [DOI] [PubMed] [Google Scholar]
  145. Wang X, Greer J, Porter RR, Kaur K & Youngstedt SD (2016). Short‐term moderate sleep restriction decreases insulin sensitivity in young healthy adults. Sleep Health 2, 63–68. [DOI] [PMC free article] [PubMed] [Google Scholar]
  146. Webb P & Hiestand M (1975). Sleep metabolism and age. J Appl Physiol 38, 257–262. [DOI] [PubMed] [Google Scholar]
  147. Wehrens SM, Hampton SM, Finn RE & Skene DJ (2010). Effect of total sleep deprivation on postprandial metabolic and insulin responses in shift workers and non‐shift workers. J Endocrinol 206, 205–215. [DOI] [PubMed] [Google Scholar]
  148. Wehrens SMT, Christou S, Isherwood C, Middleton B, Gibbs MA, Archer SN, Skene DJ & Johnston JD (2017). Meal timing regulates the human circadian system. Curr Biol 27, 1768–1775.e3. [DOI] [PMC free article] [PubMed] [Google Scholar]
  149. Westerterp KR (2013). Physical activity and physical activity induced energy expenditure in humans: measurement, determinants, and effects. Front Physiol 4, 90. [DOI] [PMC free article] [PubMed] [Google Scholar]
  150. White DP, Weil JV & Zwillich CW (1985). Metabolic rate and breathing during sleep. J Appl Physiol 59, 384–391. [DOI] [PubMed] [Google Scholar]
  151. Wurtman RJ, Chou C & Rose CM (1967). Daily rhythm in tyrosine concentration in human plasma: persistence on low‐protein diets. Science 158, 660–662. [DOI] [PubMed] [Google Scholar]
  152. Yoshino J, Almeda‐Valdes P, Patterson BW, Okunade AL, Imai S, Mittendorfer B & Klein S (2014). Diurnal variation in insulin sensitivity of glucose metabolism is associated with diurnal variations in whole‐body and cellular fatty acid metabolism in metabolically normal women. J Clin Endocrinol Metab 99, E1666–E1670. [DOI] [PMC free article] [PubMed] [Google Scholar]
  153. Zambon AC, McDearmon EL, Salomonis N, Vranizan KM, Johansen KL, Adey D, Takahashi JS, Schambelan M & Conklin BR (2003). Time‐ and exercise‐dependent gene regulation in human skeletal muscle. Genome Biol 4, R61. [DOI] [PMC free article] [PubMed] [Google Scholar]
  154. Zimmet PZ, Wall JR, Rome R, Stimmler L & Jarrett RJ (1974). Diurnal variation in glucose tolerance: associated changes in plasma insulin, growth hormone, and non‐esterified fatty acids. Br Med J 1, 485–488. [DOI] [PMC free article] [PubMed] [Google Scholar]
  155. Zitting KM, Vujovic N, Yuan RK, Isherwood CM, Medina JE, Wang W, Buxton OM, Williams JS, Czeisler CA & Duffy JF (2018). Human resting energy expenditure varies with circadian phase. Curr Biol 28, 3685–3690. [DOI] [PMC free article] [PubMed] [Google Scholar]
  156. Zvonic S, Ptitsyn AA, Conrad SA, Scott LK, Floyd ZE, Kilroy G, Wu X, Goh BC, Mynatt RL & Gimble JM (2006). Characterization of peripheral circadian clocks in adipose tissues. Diabetes 55, 962–970. [DOI] [PubMed] [Google Scholar]

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