Meal timing · when matters as much as what餐律 · 什么时候吃, 跟吃什么一样重要

Place · Level 3 · Macros

昼夜节律决定代谢窗口 · 早吃午吃 > 晚吃 · 10-12h 进食窗 (TRE) · 早餐不是最重要一餐

Metabolism is circadian

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代谢有昼夜节律

Nearly all metabolic enzymes / hormones / transporters in the human body have 24-hour rhythms (Panda 2016 Science). 'The same food eaten during the day vs at night can produce entirely different metabolic responses.'

Major circadian metabolic phenomena:

Insulin sensitivity: morning > noon > evening. The same sugar load at breakfast produces 30-50% lower postprandial glucose than at dinnerWhite / brown adipose activity: daytime favors breakdown, night favors storage (opposite of exercise)Hepatic glycogen synthesis: active during the dayglucagon-like peptide-1: A gut hormone released after eating that makes you feel full and helps lower blood sugar. (satiety hormone): response to breakfast > response to dinnerCore temperature: peaks in late afternoon → evening → trough in early morningCortisol: highest at waking (cortisol awakening response, CAR), driving glucose + metabolism
'Late eater' phenomenon (Garaulet 2013 Int J Obes):

Median lunch ≥ 15:00 vs ≤ 13:30 → same diet + same total calories + same exercise, weight loss 25% slowerThis isn't 'miscounted calories' — the body handles the same calories with different efficiency at different times
Why eating late is metabolically worse:

Evening insulin sensitivity ↓ → same sugar load → higher glucoseEvening GI motility ↓ → slower emptying → reflux riskEvening energy expenditure ↓ (basal metabolic rate falls in deep night)Disrupts downstream sleep (REM-phase digestion → ↓ sleep quality)Short dinner-to-breakfast gap → compresses the 'fasting window' (metabolic recovery)
Evolutionary background:

Human ancestors foraged in daylight + fasted at nightElectric lighting + 24-h food access → metabolic rhythm decoupled from biological clockShift work / time zones / habitual late eating → 'social jetlag' — associated with obesity + DM + CVD

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