24/09/2025
Studies reveal that sleep duration dramatically changes how your body responds to diet. In one trial, people sleeping only 5.5 hours lost 55% less fat and 60% more muscle than those who slept 8.5 hours, despite identical diets. Lack of sleep disrupts hormones like ghrelin and leptin, fueling hunger even when calories aren’t needed, while cortisol rises, signaling the body to conserve energy. At the same time, insulin resistance develops, driving calories into fat storage instead of energy or muscle repair. In short, poor sleep rewires metabolism, making the same food more likely to become fat and less likely to support muscle.
đź“š Source: Nedeltcheva et al., Annals of Internal Medicine
