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Home > Medical Dictionary > Medical Dictionary Terms Beginning with P > Protein
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Protein

Protein: One of the three nutrients that are used as energy sources (calories) by the body. (The other energy sources are in the form of fats and carbohydrates. Proteins are essential components of the muscle, skin, and bones of animals. Proteins and carbohydrates each provide 4 calories of energy per gram, while fats provide 9 calories per gram.