Metabolism, the rate at which food is converted to energy and expended by the body. People with a high metabolic rate can eat virtually as much as they want without gaining weight, whereas others, with low metabolism, may eat literally half as much yet gain weight readily.

Webster Dictionary Meaning

1. Metabolism
- The act or process, by which living tissues or cells take up and convert into their own proper substance the nutritive material brought to them by the blood, or by which they transform their cell protoplasm into simpler substances, which are fitted either for excretion or for some special purpose, as in the manufacture of the digestive ferments. Hence, metabolism may be either constructive (anabolism), or destructive (katabolism).
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