eli5: How does the body store power
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Short answer, chemicals. The shortest term form of power in your body is a molecule called adenosine triphosphate (ATP). Some of amount of ATP is floating around in your cells right now. When your cells need energy they will consume the ATP by converting it into other chemicals. This chemical conversion process creates energy as a byproduct.
The next closest store of energy is sugar. Sugar can quickly be converted to ATP which can then power your cells.
Longer-term, fat can be converted into sugar. But, this process takes longer.
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