
A randomized trial found that going to bed earlier is associated with roughly 1.3 pounds of weight loss per hour of earlier sleep onset in adults with prediabetes. This effect was independent of total sleep duration, meaning the timing of sleep onset mattered more than how long participants slept. The mechanism likely involves reducing late-night eating and lowering stress hormones that drive appetite.
The core mechanism appears to be aligning food intake with the body's optimal metabolic window to avoid late-night eating when insulin sensitivity is lowest. However, the study did not show improved blood sugar levels, suggesting the weight loss benefit may be distinct from direct glycemic control in this specific cohort.
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