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The vast amount of proteins that exist in the body have wide-ranging roles in addition to providing a source of energy. Proteins also comprise the major structural material throughout the body including muscle, bone and various tissues. Proteins allow the body to stay healthy via the immune system, move, communicate intercellularly, and regulate many chemical reactions needed to sustain life.
References
McGuire, M., & Beerman, K. (2012). Nutritional Sciences: From Fundamentals to Food (3rd ed.). Brooks Cole.