What Roles Does Protein Play in the Body?

Protein is considered a macronutrient, which means that your body needs it in large amounts every day to function properly. When you eat protein, your body breaks it down into amino acids that are used for several purposes. Protein can provide your body with energy when necessary, but you should not rely on protein as a primary energy source because it has more important physiological roles to play, according to “Nutrition and You” by Joan Salge Blake.