> Yes. Hunger is a bodily function and it's not necessarily regulated correctly

We're talking about a spectrum of people. The OP is correct an overwhelming majority of the time. The vast number of overweight people are not disregulated to the point self-control is not possible.

Of course, you are also correct some small percentage of the time. Some people need some help, and some people need serious medical intervention.

The core issue is that weight crosses into some discussion about identity politics and suddenly we're no longer talking about what's good or bad for you physically. "Big is beautiful" is simply wrong. You might be attracted to people who are fat or who smoke, but personal attraction isn't related to what is objectively bad for you.