^^x2 on the diet thing. my diet is not completely sorted out so I shouldn't talk too much, but at one point in my life while training for a half-ironman triathlon (1.2 mile swim, 56 mile bike, 13.1 mile run) I was probably doing 15+ hours a week of some form of cardio. a lot of it was long, slow distance on the bike or run. anyway, i basically ate whatever i wanted because it tasted good and i knew i'd burn most of it, but i was not ripped by any means.

long story short: cardio is not the complete answer. diet and cardio is.