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Metabolism refers to the group of physical and chemical processes by which a living cell or organism converts oxygen and food into energy. In metabolism some substances are broken down to yield energy for vital processes while other substances, necessary for life, are synthesized. 
- ↑ Gastelu, Dan; Hatfield, Frederick C (2006). Specialist in Performance Nutrition: The Complete Guide. Carpenteria, CA: ISSA, 17.