I think though what people are missing is that being really heavy and in shape is not entirely as healthy as being thin and in shape, in terms of long-term viability of organs. Sure you can be solid and have low body fat, and that's obviously better than being the same weight and out of shape. But I think that in the long run a heart that has to pump blood to 180lbs instead of 160lbs is going to wear out sooner. Or kidneys. Or whatever. Sure Shaq is in shape right now, but I can't really imagine a 7' 350+lbs guy living to say, 70 (although the fact that he has access to the best of all possible medical care offsets that a lot, but if he was just his size and say, an wage worker without health insurance, he'd be unlikely live as long as a 5'10" 150lbs person, on average.