80 Minutes Less Sleep a Night Linked to Weight Gain
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- Columbia University researchers found that 95 adults who shaved roughly 80 minutes off their nightly sleep for six weeks gained about one pound on average, even though they normally slept 7–8 hours, by simply delaying bedtime by 90 minutes.
- Participants added 17 minutes of sedentary time per day during the sleep-restriction phase, and among men and postmenopausal women, inactivity rose by nearly 30 minutes per day — even after accounting for the extra hours they were awake.
- Study leader Marie-Pierre St-Onge argued that the standard obesity advice to "eat healthier and exercise more" is "simplistic and can be difficult to maintain" without addressing sleep as a driver of weight gain.
- First author Faris Zuraikat said one pound over six weeks sounds modest, but extrapolated to a full year, the pattern could produce "clinically meaningful weight gain" — the study was designed to mimic the chronic mild sleep loss affecting roughly 30% of adults.
- The findings, published July 6 in Annals of Internal Medicine, fill a gap left by prior research that focused on extreme deprivation (four hours of sleep) rather than the mild 5–6 hour nights common in the real world.
- Related studies using the same participant pool found postmenopausal women developed greater insulin resistance — a type 2 diabetes risk factor — and participants with elevated heart disease risk showed an influx of inflammatory cells in the heart after the same 80-minute nightly sleep reduction.
Why it matters: The study reframes obesity prevention beyond the "eat less, move more" playbook by showing that mild, chronic sleep loss alone — the kind affecting roughly 30% of adults — drives measurable weight gain and inactivity over just six weeks. Extrapolated to a year, first author Faris Zuraikat says the pattern becomes "clinically meaningful," compounding the diabetes and heart disease risk that prior research from the same Columbia cohort has already tied to losing 80 minutes of sleep a night.
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