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Nutrition is the science that interprets the interaction of nutrients and other substances in food in relation to maintenance, growth, reproduction, health and disease of an organism. It includes food intake, absorption, assimilation, biosynthesis, catabolism and excretion.
As the primary source of energy for the body, carbohydrates play a role in regulating fat and protein metabolism. With a sufficient supply of carbohydrates to meet the general needs of the body, it will not have to use protein and fat for energy. Protein will serve its primary purposes of tissue growth and repair.