i am in perfect shape, but if i eat shitty food for even a few days, i feel AWFUL, and unable to function. yet 2/3 of the country are obese slobs, who don't seem particularly un-energetic.

(http://www.autoadmit.com/thread.php?thread_id=2249803&forum_id=2:#23152339)

Even lack of exercise for a normal person will have noticeable effects. It's really true though--a healthy body= a healthy mind. This is another reason why the obesity epidemic is a serious problem--the decline in mental functioning, lack of productivity, in addition to increased costs and general visual offensiveness.

(http://www.autoadmit.com/thread.php?thread_id=2249803&forum_id=2:#23152403)