Researchers say that when you eat may be as important as what you eat when it comes to weight gain. In an animal study, scientists found that mice who ate a high-fat diet during their normal waking hours gained 20 percent in weight over six weeks. But those who ate the same high-fat diet during the hours they should have been sleeping gained 48 percent in weight over six weeks. Researchers say they suspect that the results would be the same in humans, and they say this study as well as others casts doubt on the conventional "calories in, calories out" idea of weight gain.
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