You may think that the only people who should be supplementing with whey protein are those who are trying to add muscle mass. But whey protein provides numerous advantages for anyone who consumes it. In addition to providing the raw materials — amino acids — for building muscle mass, whey protein also can help you lose more body fat, primarily by decreasing appetite. Research on whey protein has found that having a whey protein shake significantly reduces the amount of food people put down at meals later in the day. This is because whey boosts levels of hunger-fighting hormones, keeping you feeling full longer than other protein powders and foods.