Just 78 Minutes Less Sleep a Night Could Lead to Weight Gain

Tip the Scales: Good sleep is essential for keeping nearly every system in our body working properly, including our hormones, brain, and heart. Need more incentive to catch more zzz’s? A new study has found that losing even a modest amount of sleep could contribute to weight gain. 

The Study: Researchers studied 95 people who were already at risk for heart or metabolic disease and normally slept between seven and eight hours a night. Each participant experienced two different sleep conditions over a six-week period. During the “adequate sleep” window, they slept their normal seven hours or more. During “sleep restriction,” they went to bed 1.5 hours later than normal, losing 90 minutes of sleep time. Participants wore wrist trackers to monitor sleep and activity levels. Their hormones, BMI, body composition, and waist circumference were measured multiple times.

The Takeaway: Participants who slept an average of 78 minutes less per night gained nearly one pound of weight compared to when they got adequate sleep. They also gained an average of a half-centimeter around their waist and had 17 more minutes a day of sedentary time.

Keep in Mind: Because the study was small and lasted only six weeks, it can’t prove long-term weight gain — but the researchers say chronic sleep restriction could have a much greater impact over time.