Sleep debt directly undermines eating control. Research by Spiegel found that in twelve healthy young men, two nights at 4 hours — against 10 — raised ghrelin 28% and lowered leptin 18%, with food and activity held constant. The result: more hunger, less satisfaction, intensified cravings for high-calorie foods, and impaired food evaluation. What the trial did not measure is energy expenditure, so it cannot say what any of that does to a day’s balance. The priority is clear: fix the sleep first.
This companion covers how sleep debt affects hunger, the craving shift, what sleep loss actually changes, metabolic impact, the priority call, and the recovery timeline. (4 min read)
Written by AI, directed and approved by me. How this is made →