"Physical fitness is not only one of the most important keys to a healthy body, it is the basis of dynamic and creative intellectual activity. The relationship between the soundness of the body and the activities of the mind is subtle and complex. Much is not yet understood. But we do know what the greeks knew: that intelligence and skill can only function at the peak of their capacity when the body is healthy and strong."

John F. Kennedy 

What john is saying is if you set your mind up to a goal and say lets eat healthy and good your life would become easier it will help you become a better person not only in your weight but also in your health. You will develope memorization and how to think when needed because your bodyies function ends up realizing what it needs to do to work on you. Yeah, sometimes you wont be the best kid to be fit but youll be smart. But you know they say "healther body a healther me." That is also important your body functions on fuel so if you dont give it the energy it needs it wont do anything.