What is metabolism? | Live Science

When you consider metabolism, you likely think about digestion and energy expenditure. Although it’s a bit more complicated than that, metabolism is often simplified to this. For example, the Mayo Clinic says that metabolism is a conversion process where the body turns the calories you ingest into energy.

But the conversion of calories into energy is actually a complex process that includes more than just digestion. According to the U.K. National Health Service, metabolism refers to all of the chemical processes that occur within the human body. These processes work to repair damage and keep your body functioning continuously, regardless of whether you’re asleep or awake.

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