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your body burns calories it already has in it's system to process the food, but only a minor amount for most foods, protein and fibre takes more energy to process, regular sugar carbs break down the fastest, the most proteins, fat is usually the slowest. in general your body will probably start using the calories you just ate anywhere from 10-15 minutes after ingestion, and may continue to use them until they're finished in the large intestine

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16y ago
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12y ago

Our body uses calories by doing an activity !

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12y ago

in about an hour

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Q: When does the body begin absorbing food calories?
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