Nutrition
Importance, & Food
nutrition, the assimilation by living organisms of food materials that enable them to grow, maintain themselves, and reproduce.
MyPlate dietary guidelines from the U.S. Department of Agriculture
Food serves multiple functions in most living organisms. For example, it provides materials that are metabolized to supply the energy required for the absorption and translocation of nutrients, for the synthesis of cell materials, for movement and locomotion, for excretion of waste products, and for all other activities of the organism. Food also provides materials from which all the structural and catalytic components of the living cell can be assembled. Living organisms differ in the particular substances that they require as food, in the manner in which they synthesize food substances or obtain them from the surrounding environment, and in the functions that these substances carry out in their cells. Nevertheless, general patterns can be discerned in the nutritional process throughout the living world and in the types of nutrients that are required to sustain life. These patterns are the subject of this article. For a full discussion of the nutritional requirements of humans in particular, see the article nutrition, human.
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