>the opposite is true for some people, who have better regulation of whatever chemical makes you hungry. Apparently there are lots of people for whom feeling hungry after eating a large meal seems impossible. And since this is something they have never experienced, it's not really reasonable to expect them to understand or be able to imagine it.
I don't know, I found the idea of "what if I was hungry, but too much instead of too little" pretty easy to wrap my head around I think. I also wouldn't call feeling full necessarily as being the same thing as being well regulated, anorexics can feel full but they're hardly well regulated.
I once knew this fairly average weight bodybuilder that hated fat people with a passion and practiced a strict diet. During one of his many anti fat people rants, he started ranting about how fat people have no discipline, I sort of snapped back at him and pointed out my many struggles with eating and asked him "why it is that you complain that fat people are undisciplined but don't criticise me in the same way when you know I don't have a good diet and struggle to put on weight?" He didn't have a response to that and the conversation awkwardly ended.
For me, it was pretty easy to come to essentially the same conclusion you did from the opposite starting point. That it's possible for everybody to change their weight by committing, but for some people like this bodybuilder they're going to be able to maintain a healthy weight without struggling, and for others it's going to be a slog.
It's those who seemed to control their weight at will I couldn't empathise with, fat people were relatively relatable.