Almost 80% living substance of human body is

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Protein. Excluding water and fat, the human body is made up almost entirely of protein. Protein is the main component of muscles, bones, organs, skin, and nails. Excluding water, muscles are composed of about 80% protein, making this nutrient especially important for athletes. The body breaks down consumed protein into amino acids, and absorbs it. It is used to build muscles and organs, to make hormones and antibodies, to be stored as fat, and to be burned as energy.

Almost 80% living substance of human body is

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