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The act or process of nourishing or being nourished specifically: the sum of the processes by which an animal or plant takes in and utilizes food substances foods that are necessary for human nutrition.
Nutrition is the biochemical and physiological process by which an organism uses food to support its life. It includes ingestion, absorption, assimilation, biosynthesis, catabolism and excretion. The science that studies the physiological process of nutrition is called nutritional science (also nutrition science).