Losing just 80 minutes of sleep a night adds up fast. A new study found that adults with cardiometabolic risk who slept about 80 minutes less per night for 6 weeks gained nearly half a kilogram, added half a centimeter to their waistline, and spent 17 more minutes a day sitting idle. Researchers say clinicians should start making sleep a routine part of weight and obesity conversations.
Think skipping a full night of sleep is the only way it affects your health? Think again. A new study published in the Annals of Internal Medicine found that shaving just 80 minutes off your nightly sleep — for six weeks — was enough to cause measurable weight gain and metabolic changes in adults already at risk for heart disease and diabetes.
The study pooled data from two randomized crossover trials involving 95 adults from the New York City area. Participants alternated between 6 weeks of adequate sleep (7+ hours) and 6 weeks of mild sleep restriction (going to bed 1.5 hours later than usual). Researchers tracked weight, waist size, body volume, hormone levels, and physical activity throughout.
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Why it matters: Sleep is often overlooked in clinical weight management conversations — but this study makes a strong case for changing that. Even modest, sustained sleep loss nudges the body toward weight gain and inactivity, suggesting that sleep counseling could be a meaningful tool in obesity prevention.
