Columbia scientists have studied the records of more than 6,100 people and found out that people who slept less than 4 hours a night were 73% more likely to be obese than those who slept for 7-9 hours.
More Info: Plenty of sleep an easy recipe for weight loss [1]
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[1] http://159.54.226.83/apps/pbcs.dll/article?AID=/20041121/OPINION/411210316/1048