It requires no discipline to get fat, but maybe they put their discipline to other areas in life. Outwards appearance doesn't make the person who they are, it just says they lacked discipline to stay in shape. Like Tombo said, most of them are probably prone to putting on fat.
so what , asthmatic , skinny, disabled people do their best to have a better physique, and they are far more numerous than obese people.
Do we cry a river for em? No .
I'm sorry, but yeah , being fat means lacking will and drive in your everyday life, who cares if they are rocket scientists, they re still fat lazy losers in the eye of the others "normal" people.