A process in which animals and plants involve within the intake of nutrient materials and their later assimilation into the tissues is termed as nutrition. Metabolic reactions contribute to equilibrium by gathering energy from consumed nutrients to contribute to the body’s growth, repair, and normal functioning. Metabolism is associate degree energy-balancing act between catabolic reactions and anabolic reactions. A metabolic pathway is a series of chemical reactions in a cell that build and breakdown molecules for cellular processes. Catabolic pathways break down molecules and produce energy. Because almost all metabolic reactions take place non-spontaneously, proteins called enzymes help facilitate those chemical reactions.