New research published in the July 3 edition of Cell Metabolism shows that, at least in the fruit fly, a restricted calorie diet only prolongs life if there is physical activity as well. There has been a lot of research on how calorie restriction can prolong life, a sacrifice that most people do not want to make. This research points out that calorie restriction alone is not enough. Movement is also necessary. They speculated that part of the reason could have to do with fat metabolism, and that enhanced fat metabolism could slow aging.
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