Summary
The circadian clock strongly influences metabolic responses to food, with meals consumed at waking producing lower glycemic but higher satiety/thermogenic responses than meals eaten later in the day. For lighting designers and healthcare practitioners, this underscores the importance of supporting robust circadian entrainment through appropriate light exposure to optimize meal timing, metabolic health, and weight management outcomes.
Key Findings
- Glycemic response to meals is lower at waking compared to other times of day, while satiety and thermogenic responses are higher at waking.
- Consuming a higher proportion of calories (especially carbohydrates) at breakfast versus dinner is chronically beneficial for obesity and metabolic syndrome management.
- Time-restricted feeding (TRF) within <12 hours per day improves metabolism and extends lifespan, though effects in humans are significantly driven by caloric restriction.
- Irregular meals, particularly irregular breakfasts, consistently produce adverse metabolic outcomes.
- TRF effects in rodents can be independent of caloric restriction and show day/night phase specificity, suggesting circadian phase matters beyond caloric intake alone.
Categories
Sleep & Circadian Health: Reviews how the central circadian clock governs time-of-day variations in metabolic responses to meals, including glycemic and satiety responses tied to light-dark cycles and chronobiology.
Author(s)
X Li, Z Sun
Publication Year
2023
Number of Citations
1
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