What's the Link Between Your Metabolism & Weight?

Medically Reviewed by Carolin Schneider, MD.

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While you've likely heard the term "metabolism," you may not understand what it is, exactly, and how it relates to body weight. In this chemical process, calories are converted into energy, which, in turn, one's body uses to function. When an individual eats more calories than needed, the excess calories are converted to fat, resulting in weight gain. Although the process of metabolism is the same for everyone, the speed at which one's body uses and burns calories hinges on that individual's metabolic rate.