Metabolism

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Understanding Your Metabolism

Metabolism is a series of processes that control how your body creates and uses energy. It converts food and drinks into energy in your body, which you can use both when you're active and when you're resting. You need it for many basic functions, such as breathing and growing. Your metabolism uses calories and oxygen to make and release energy in a form the cells in all your organs and tissues can use.

https://www.webmd.com/fitness-exercise/what-is-metabolism?