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Protein is an essential nutrient found in animal products, nuts, and beans. The name protein name comes from the Greek word protos, which means âfirst.â Your body uses proteins in your diet to build new cells, maintain tissues, and synthesize new proteins that make it possible for you to perform basic bodily functions.
Quick Answer. According to the British nutrition foundation, protein is necessary for the growth and repair of the body cells. Proteins provide structure to the cells and are important in the maintenance of cells within the body. Keep Learning.