What markers track meal timing?

Meal timing is studied under several overlapping labels — time-restricted eating (TRE), meal frequency, and circadian misalignment — and the markers used to track it fall into three broad classes: circulating biomarkers of neuronal health and inflammation, expression of circadian clock and autophagy genes, and neural or behavioural measures of energy-balance regulation. In adults with multiple sclerosis (MS), a registered trial specifies neurofilament light chain (NfL) and BDNF as markers of neuronal health, and IL-6, IL-17 and TNF-α as markers of inflammation, alongside expression of circadian clock genes and genes associated with autophagy [1]. In energy-balance research, the markers are different: resting-state neuronal processing in areas relevant to food reward and interoception, and body weight regulation itself [3].

The mechanistic work centres on the circadian clock gene network and its downstream regulation of autophagy, together with the inflammatory cytokine signalling pathways (IL-6, IL-17, TNF-α) that are read out as systemic markers of meal-timing effects [1].

Research Studies

NfL and BDNF as neuronal-health markers in adults with MS

A clinical trial in adults with MS is designed to test whether the time an individual eats each day affects biomarkers of neuronal health — specifically neurofilament light chain (NfL) and BDNF — and biomarkers of inflammation (IL-6, IL-17, TNF-α). Participants are instructed to start and stop eating at specific times each day according to group assignment and personal schedule, and record responses to smartphone prompts [1]. The trial frames meal timing as an exposure and the listed circulating markers as the readout.

Circadian clock and autophagy gene expression in adults with MS

The same trial asks a second question: whether meal timing affects expression of circadian clock genes and genes associated with autophagy in adults with MS [1]. This places gene-expression markers alongside the circulating protein markers in the same population, so that a meal-timing intervention is assessed at both the transcriptional and the circulating-protein level.

Meal frequency and appetite control in obesity research

A separate trial addresses time-restricted eating and meal frequency for appetite control, set against the background that worldwide the percentage of overweight and obesity among adults now exceeds 1.9 billion and 650 million, respectively, and that overweight and obesity are associated with increased risk of type 2 diabetes, coronary heart disease and hypertension. The evidence block notes that non-nutritional factors such as the number of meals eaten — meal frequency — can be as important to body mass as the type and amount of food consumed [2].

Circadian misalignment and resting-state neuronal processing

Preliminary findings from one investigators' lab suggest that circadian misalignment — occurring when meals and sleep are mistimed from one another — alters resting-state neuronal processing in areas relevant to food reward and interoception, supporting a role of sleep and meal misalignment in energy balance regulation [3]. The same source states that no study has been done to disentangle the effects of sleep and meal timing on body weight regulation, independent of sleep duration [3].

Markers compared across the two research contexts

Where the evidence is preliminary or unresolved

The neuronal-processing findings on circadian misalignment are described as preliminary, from the investigators' own lab [3]. The same evidence block states plainly that no study has been done to disentangle the effects of sleep and meal timing on body weight regulation, independent of sleep duration [3]. No animal-only or in vitro marker data are supplied in the evidence block for this topic.

Populations named in the evidence

• Adults with multiple sclerosis — NfL, BDNF, IL-6, IL-17, TNF-α, circadian clock and autophagy gene expression [1].
• Adults with overweight or obesity — meal frequency and appetite control [2].
• Shift workers, and those with jetlag or social jetlag — named as the populations to whom meal- and sleep-timing messaging is intended to translate [3].

What the markers are used to distinguish

Across the evidence, the marker set is used to separate three questions: whether meal timing moves neuronal-health and inflammatory markers in a clinical population [1]; whether it moves clock and autophagy gene expression in that same population [1]; and whether mistiming meals relative to sleep alters neural processing relevant to food reward and interoception, and body weight regulation, in energy-balance research [3]. Meal frequency is treated as an exposure variable in its own right in obesity research [2].

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Sources

• [1] Understanding the Impact of Meal Timing on Neurological Health in Adults With Multiple Sclerosis — https://clinicaltrials.gov/study/NCT07475377
• [2] Time Restricted Eating and Meal Frequency for Appetite Control — https://clinicaltrials.gov/study/NCT07805291
• [3] Circadian Misalignment and Energy Balance — https://clinicaltrials.gov/study/NCT03663530