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metabolism. 1. biotransformation. 2. the sum of the physical and chemical processes by which living organized substance is built up and maintained (anabolism), and by which large molecules are broken down into smaller molecules to make energy available to the organism (catabolism).
So in the spirit of furthering science and making nutrition and health a lot more interesting, letâs take a look at the old definition of metabolism, and come up with a newer one thatâs more crispy and fresh. Hereâs the basic, undisputed classic textbook definition of metabolism: Metabolism is the sum total of all the chemical reactions in the body. Are you surprised itâs that simple? Of course, we can talk about the metabolism of such specific tissues as the liver and thyroid. We can talk about the metabolism of specific substances such as cholesterol.