He can't be as big as he was even if he tried. They talk like they have a choice in the matter, that they "chose" the health look. So it's kinda only half true at best.
But the lesson of the story to me is, if you are a bb, become an alcoholic for half the year, stop training and eating. The magic of alcohol, the fountain of youth. Vince Taylor keeps drinking his Scotch daily I'm sure. William Burroughs had this theory on heroin, it keeps you young because you are shrinking when using and then hopefully expanding if you manage to be clean for a while. The body likes this cycle.