Metabolism is a term that is used to describe all chemical reactions involved in maintaining the living state of the cells and the organism. There are two types of metabolic reactions: anabolic and catabolic. An anabolic reaction builds large molecules from smaller molecules. The thyroid's main role in the endocrine system is to regulate your metabolism, which is your body's ability to break down food and convert it to energy. ... Every other cell depends on the thyroid to manage its metabolism. The pituitary gland and hypothalamus both control the thyroid. Metabolism is the process by which your body converts what you eat and drink into energy. During this complex biochemical process, calories in food and beverages are combined with oxygen to release the energy your body needs to function.
