catabolism

/kəˈtæbəˌlɪzəm/
noun
  1. The process in living things by which complex molecules are broken down into simpler ones to release energy.
    • The body's catabolism of food releases the calories you need to stay active.
    • Catabolism is the opposite of anabolism, which builds up molecules in the body.
    • During exercise, catabolism breaks down stored fat to provide energy for your muscles.
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