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After about 10 minutes of exercise, your body will start a transition to fat as a fuel
source. It takes this long for the stored fat to release free fatty acids into the
blood in sufficient numbers to satisfy the demands of so many hungry muscle cells. After
about 30 minutes fat becomes the primary fuel source, with a small "primer" of
glycogen. (Just because you're burning fat doesn't mean you should be eating a lot of
fat. Carbohydrates are the best source of energy; too much dietary fat can hamper
your performance.)
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