17 January 2011
When dieting to lose weight, how much you sleep may be as important as how much you eat
www.medicalnewstoday.com
According to a new study being published in Annals of Internal Medicine, the flagship journal of the American College of Physicians, lack of sleep may hinder a dieter's ability to shed excess body fat.

Ten overweight but otherwise healthy adults on a moderate calorie-restricted diet were randomly assigned to sleep either 5.5 hours or 8.5 hours each night in a closed clinical research environment. After two weeks, researchers measured loss of fat and lean body mass. Compared to participants who slept 5.5 hours a night, the dieters that slept for 8.5 hours lost 56 percent more body fat. The dieters in the sleep restricted group had lost less fat and more lean body mass.

"These results highlight the importance of adequate sleep for maintenance of fat-free body mass when dieting to lose weight," said Plamen Penev, MD, PhD, who is an assistant professor in endocrinology at the University of Chicago and lead author of the study.

According to the Human Performance Institute (HPI), “Even small amounts of sleep
debt—insufficient recovery in our terms—have a significant impact on strength, cardiovascular capacity, mood and overall energy levels.”
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