Your body should be treated like a Cadillac, meaning it needs superunleaded fuel to run correctly. If you only give it regular unleaded, it screws up the engine. The same goes for feeding your body. If you are constantly giving it junk food, it can't perform optimally. Eating good-for-you foods helps fuel the body, build muscle, and burn fat. There is absolutely no way to lose weight by neglecting this essential part of the equation.