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What is metabolism? Metabolism can be defined as the set of physical and chemical changes that occur inside the human body that provide adequate energy for life processes and the synthesis of new materials. Metabolism allows the body to grow and function.
Digestion is important for breaking down food into nutrients, which the body uses for energy, growth, and cell repair. Food and drink must be changed into smaller molecules of nutrients before the blood absorbs them and carries them to cells throughout the body.