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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.
1 Essential body processes such as water balancing, nutrient transport, and muscle contractions require protein to function. 2  Protein is a source of energy. 3  Protein helps keep skin, hair, and nails healthy.  Protein, like most other essential nutrients, is absolutely crucial for overall good health.