Yes, by "fit" I meant "not fat". And if a person doesn't lose weight from the exercise, then I'd say it's a strong indicator their exercise isn't an Olympic lev

Yes, by "fit" I meant "not fat". And if a person doesn't lose weight from the exercise, then I'd say it's a strong indicator their exercise isn't an Olympic level Michael Phelps training, which would give them the metabolism to counteract the effect of junk food. Even with heavy exercise, I have a strong suspicion your doctor wouldn't recommend you a diet like that. Just because by some miracle it works for one guy (and who knows what the consequences are going to be in a couple decades), doesn't mean it's good advice for the general populace.