Cutting sleep by 80 minutes per night increased body weight and waist circumference in adults with cardiometabolic risk factors.
“After six weeks, participants were about 1 pound (0.45 kg) heavier and had waists about 0.5 cm larger under shorter sleep, but MRI scans did not show a clear shift in body fat or skeletal muscle proportions. Changes in physical activity were limited to sedentary time.”