Fatness really isn't necessarily caused by laziness or good eating, because some people are just fat-prone or caused by taking too many hormone drugs.
I think a lot of people are easy to fat body, I see as if there are some celebrities are also, their digestive ability is better, all the food eaten are digested and is the nutrients are returned to their own use of the kind, so this kind of people really easy to get fat, not because they are how lazy, because even if they exercise, may be digested better, because after the exercise to eat the digestion of the absorption of the strength is twice as much as usual.
There is another kind of hormone thing to eat too much, I read a short story when I was a kid, as if the girl because of the body is not good from childhood to take drugs containing a lot of hormones, so the growth of more fat, she has a crush on a boy, it is always to give the boy to send desserts, the dessert seems to be a little bit of bitterness because of the drugs inside, and then she died the boy only know why she always like to eat that kind of Dessert. I at first just as a story to see, until later when the school, met so a classmate, she is very short and very fat, according to her own words, because of childhood often sick, as if it is a kind of big disease, it has been treatment, injections, medication, and finally became this way, in fact, her own is also very no way.
So don't look at the surface, there are a lot of things we don't know, and don't so comment on others. Just like that girl she herself is very low self-esteem, but there is no way to get fat and lifeless she must choose one, in exchange for anyone who must think to survive it. And fat and lazy have nothing to do with, how not to say that thin people lazy to eat so thin?