Protein is composed of amino acids. it is required to synthesize and repair muscle and other tissues and maintain fluid and acid-base balance in the body. proteins also function as enzymes, hormones, and transporters. if necessary, the body uses protein to meet energy needs (4 kcals per gram). excess kcals from protein are stored as body fat. if you consumed 60 grams of protein in a day, how many kcals would this convert to?