Protein is a macro nutrient necessary for the proper growth and function of the human body. There is considerable debate over the amount of protein a person needs to consume per day, the current recommended daily intake (RDI) for protein is 46 grams for women aged 19-70, and 56 grams for men aged 19-70. Any excess protein is turned into energy by the body, and it is controversial whether this excess protein causes a strain on the liver.