Having read about a time before people in the US were unremitting assholes, I note that... oh never mind, there was no such time.
If you take a shit on people's emotional state, their eating disorder is only more likely to plague them.
You're right that they have to make the choice to not be fat, but frankly I don't think it's so simple as to say that people actually chose to be fat to begin with. Addiction is a real thing, and food really is addictive.
One of the biggest problems I see is that people don't know how to cook any more. I don't know what happened there, but it's pathetic.