Well, basically EVERYTHING. Fats and Carbohydrates are used primarily for energy in the body. Protein can also be broken down and used as an energy source, but only when there’s not enough carbohydrates to fuel the body and there’s an over-abundance of protein available. Proteins are also used by the body to : · Create bodily tissues such as muscles, bones, organs, etc . · To form Enzymes (catalysts for chemical reactions in the body, such as your metabolism and digestion) and Cellular Transporters (which maintain the balance of electrolytes in the body, the transportation of oxygen and carbon dioxide through the bloodstream, and the transportation of fats in the body) · For Cell Signaling (relaying chemical “messages” into and out of the cells) · To maintain Fluid Balance (allo...