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A new study found that sleeping less induces people to consume more calories. Normal fit young men who get four hours of sleep were found to eat a Big Mac’s worth of extra calories compared to those who get eight hours of sleep. Experts theorize that sleep restriction could contribute to one of the risk factors for the obesity epidemic over the past years.

The study participants were tracked in their normal routines as they were split into two groups. One group slept at midnight and woke up at 8am. The other group went to bed at 2am and woke up at 6am. Both groups had to record their eating and activities in a journal. The men who had a shorter amount of sleep were found to consume 22% more calories (560 cal) on average than those who took 8 hrs of sleep.

The researchers suggest that more calories are consumed with less sleep because mammals have evolved to increase caloric intake during the summer when nights are shorter and food is plentiful. It is best to get enough sleep so that the bodies can function properly. Many recovery processes happen during sleep and it is not a waste of time.

Source: American Journal of Clinical Nutrition, online March 31, 2010.

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