Why 7 hours of sleep is mandatory for weight loss

16 Mar 2026 · 1 min

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In this brief monologue, Eric Roberts explains that research shows people who sleep less than seven hours a night consume almost twice as many calories. The increase is driven by hormonal changes: sleep loss raises ghrelin, the hunger hormone, and lowers leptin, the satiety hormone. This hormonal imbalance leads to heightened hunger, stronger cravings, and makes it harder to maintain a calorie deficit, undermining weight‑loss efforts even when other habits are optimal.

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A study found people who had sleep deprivation, anything less than 7 hours of sleep, ended up eating almost double the amount of calories. When your sleep quality drops, your 2 hunger hormones flip on you. The first hormone is ghrelin. This is the hormone that makes you hungry. The second hormone is leptin. This is the hormone that keeps you full. When you don't get adequate sleep, your ghrelin increases and your leptin decreases. So no matter if you're doing everything else right, you're still going to be hungrier, have more cravings, and less likely to stick to your calorie deficit.