Losing Just 78 Minutes of Sleep a Night Over 6 Weeks May Lead to Weight Gain

A recent study from Columbia University has revealed that even a minor reduction in sleep—specifically, losing around 78 minutes each night over a six-week period—can lead to noticeable weight gain and increased sedentary behavior. This research underscores the vital role that sufficient sleep plays in weight management and overall health.

Published in the *Annals of Internal Medicine*, the study involved 95 adults aged 20 and older, all of whom were considered at higher risk for heart and metabolic diseases. Participants typically slept at least seven hours per night before the study commenced. Researchers implemented a randomized crossover design, allowing each participant to experience two different sleep conditions over six weeks: one where they maintained their usual sleep habits (adequate sleep) and another where their bedtime was delayed by 1.5 hours, resulting in reduced sleep (sleep restriction).

To ensure participants adhered to their sleep schedules, the researchers used wrist-worn devices to monitor movement and estimate sleep duration. Participants also kept daily sleep diaries, which the research team reviewed regularly to verify compliance. Detailed measurements, including weight, waist circumference, and body composition through MRI scans, were taken before and after each sleep condition. Hormones related to hunger and energy balance were also assessed through blood samples.

The findings were significant. Participants who experienced sleep restriction gained an average of nearly 1 pound and saw an increase in waist circumference by about half a centimeter. This abdominal weight gain is particularly concerning due to its association with heart disease. MRI scans indicated an increase in whole-body volume, although the ratio of fat to muscle remained unchanged, suggesting the weight gain wasn’t purely due to fat accumulation.

In addition to weight gain, the study found that participants became more sedentary, spending approximately 17 more minutes per day inactive during the sleep restriction phase. Despite no significant change in calorie expenditure, the combination of reduced sleep and increased inactivity likely contributed to the observed weight gain.

Experts emphasize the importance of quality sleep in weight management. Dr. Jessica Duncan, a board-certified obesity medicine physician, noted that inadequate sleep disrupts hunger hormones, leading to cravings for high-calorie foods and reduced impulse control. This means that fatigue can impair judgment, making healthier food choices more difficult.

Registered dietitian Destini Moody stresses that sleep is a crucial factor in appetite regulation, energy levels, and body composition. She recommends maintaining a consistent sleep schedule, creating a calming bedtime routine, and limiting screen time before bed to improve sleep quality. Additionally, reducing caffeine and alcohol intake, particularly in the evening, can further enhance sleep.

Overall, this study highlights the need for individuals to prioritize sleep as part of a healthy lifestyle. The evidence suggests that even small reductions in sleep can significantly impact weight and health, making it essential for people to aim for at least seven hours of restorative sleep each night. If sleep issues persist, consulting a healthcare professional is advised to explore potential underlying sleep disorders.