Timing of Breakfast, Lunch, and Dinner. Effects on Obesity and Metabolic Risk.
Level 5 - mechanism / opinion, no new human data
Narrative review without systematic search or meta-analytic pooling
PubMed 31684003 · doi:10.3390/nu11112624
What was done
The authors conducted a narrative review of animal and human literature examining the timing of breakfast, lunch, and dinner. The review explored how food intake synchronizes peripheral circadian clocks across digestive and metabolic tissues (stomach, gut, liver, pancreas, adipose tissue) and assessed mechanisms linking meal timing to glucose tolerance and obesity-related outcomes.
What was found
The abstract reports no numerical data, effect sizes, or specific statistical findings. It qualitatively reports that food intake is a primary external synchronizer of peripheral clocks and concludes that unusual or late meal timing disrupts the circadian system, potentially promoting fat accumulation and reducing the efficacy of weight loss interventions.
Why it matters
This review synthesizes chrononutrition concepts, emphasizing that the timing of macronutrient intake relative to circadian rhythms may represent an independent determinant of metabolic health alongside total energy intake.
Limits
As a narrative review, it lacks systematic search criteria, screening protocols, and risk-of-bias assessments. The abstract cites animal model mechanisms that may not directly translate to free-living humans, provides no sample sizes, and does not control for confounding variables such as total caloric intake, macronutrient composition, or sleep duration.
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