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A 51-year-old member asked:

Which form of caloric energy does the body burn first: fat or sugar?

1 doctor answer3 doctors weighed in
Dr. Dean Giannone
Internal Medicine 25 years experience
Burning calories.: If you've already eaten, your body will start to burn carbohydrates first, then fats. That's why I like when people exercise in the morning before eating; given the carbohydrate stores are empty in the morning, that exercise will be fueled by fats mainly.

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Last updated Mar 2, 2015

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