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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.
Health topics. Nutrition. Nutrition is the intake of food, considered in relation to the bodyâs dietary needs. Good nutrition â an adequate, well balanced diet combined with regular physical activity â is a cornerstone of good health. Poor nutrition can lead to reduced immunity, increased susceptibility to disease, impaired physical and mental development, and reduced productivity.