Nobody has to be fat, but some people may have to exercise for many hours just to control their weight. For example, a gene associated with fatness has been identified in the Amish who live near Lancaster, PA. A study from the University of Maryland shows that Amish men with that obesity gene who burned more than 980 calories per day through physical activity were not fat. The same applied to women who burned more than 860 calories per day (Archives of Internal Medicine, September 2008).
Exercise causes you to eat more food, but when you are very active, you do not increase the amount of calories to equal what you burn. For example, if your exercise program causes you to burn 1000 more calories per day, you will usually increase your food intake by about 500 calories, and probably significantly less than that. More
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