A new study from the University of Colorado Boulder indicates that people who don't get enough sleep tend to over eat, causing them to gain weight. For the study, participants were limited to five hours of sleep a night over the work week and given unlimited access to food. Staying up later may have burned extra calories, but the extra food the subjects ate more than offset that difference.
Previous research has shown that a lack of sleep can lead to weight gain, but the reasons for extra pounds were unclear. In the new study, published March. 11 in the Proceedings of the National Academy of Sciences, the researchers show that, while staying awake longer requires more energy, the amount of food study participants ate more than offset the extra calories burned. [Colorado]