How Bodybuilders Lose Fat And Gain Muscle What are the two primary features that distinguish bodybuilders from the rest of the population? First, bodybuilders have more muscle mass than everybody else. Second, they have less body fat than everybody else. It’s so simple that it hardly seems worth mentioning, but it really is important to keep in mind. If you want to look like a bodybuilder you need to lose fat and gain muscle. Generally if you want to lose fat, you need to eat a low calorie diet and exercise more. If you want to gain muscle you have to combine weight training and a higher calorie diet. So it seems that it would be very difficult, if not impossible, to lose fat and gain muscle at the same time.