4. Longevity: Do you want to eat chicken breasts and broccoli forever? Even bodybuilders cycle their diet, eating more calories during the off season to pack on muscle, and then changing their diet to shed pounds of body fat for competitions. It's a tough lifestyle that requires a lot of commitment, and most of us are more interested in staying reasonably lean year round instead of swinging between gaining and losing weight. Plain and simple, bodybuilders ultimately have different goals, and their lives revolve around getting up on stage at sub-10 percent body fat.