Early but Not Late Time-Restricted Eating Improves an Actigraphy-Estimated Sleep Quality in Women with Overweight or Obesity: Secondary Analysis of the Crossover ChronoFast Trial

Why It Matters

Aligning food intake with the early circadian phase can enhance sleep architecture without altering weight or hunger, offering a non‑pharmacologic tool for metabolic health in overweight populations.

Key Takeaways

• eTRE improved actigraphy sleep efficiency by 1.1% versus baseline
• Sleep fragmentation index fell 1.7% during early time‑restricted eating
• Subjective PSQI scores remained unchanged for both early and late TRE
• Evening hunger and satiety ratings did not differ between eTRE and lTRE
• Largest sleep gains observed in women with lowest baseline sleep efficiency

Pulse Analysis

Early time‑restricted eating (eTRE) taps into the body’s natural circadian rhythm, positioning the bulk of caloric intake before the evening melatonin surge. This temporal alignment reduces metabolic conflict between insulin secretion and sleep‑promoting hormones, which can translate into measurable improvements in sleep efficiency and reduced fragmentation, as captured by actigraphy. The ChronoFast trial’s objective data suggest that even short‑term shifts in eating windows can fine‑tune sleep architecture, a finding that resonates with chronobiology research linking meal timing to hormonal balance and glucose regulation.

The discrepancy between objective actigraphy outcomes and unchanged subjective PSQI scores underscores a broader methodological challenge in nutrition‑sleep research. While participants may not consciously perceive modest gains in sleep continuity, wearable sensors detect subtle reductions in micro‑awakenings and more stable sleep stages. This gap highlights the importance of incorporating objective metrics when evaluating lifestyle interventions, especially in populations where self‑report bias is common due to weight‑related stigma or expectations about diet effects.

For clinicians and wellness professionals, the study offers a pragmatic recommendation: encourage patients with overweight or obesity to compress their eating window to earlier daylight hours, even without calorie restriction. The sleep benefits appear independent of hunger or satiety, suggesting that adherence is feasible without heightened evening cravings. Future trials should extend the duration of eTRE, include diverse gender and age groups, and explore downstream effects on cardiometabolic markers such as blood pressure and insulin sensitivity, thereby solidifying early TRE as a cornerstone of holistic metabolic care.