Why do you believe this is a psychological problem and not a physiological problem?

I believe for the vast majority of people, buckling down and doing some hard exercise would make a world of difference. The greatest obstacle to that is a mental one, reinforced by culture and the medical infrastructure.

Hard exercise is the least efficient form of weight control - it is hard, it is unpleasant when you're starting out, it takes loads of time, it has a risk of injury, it is very likely to make you overeat.

Why, of all things, do you think forcing people to do hard exercise would be effective for the vast majority of people, compared to, say, an improved diet?

All those things are hyperbole, repeated endlessly to warn people away from exercise. It's a cultural thing, and we're embedded in that culture. But exercise is the normal state for humans, and to think otherwise is a weird local phenomenon.

The mirage of 'an improved diet' is the current fad idea and the topic of this conversation. Why doesn't it work for most people? Why are there 1000 books about it, and still no consensus?

I'm not sure who is supposed to be repeating this endlessly to warn people away, but most people discover these things if they actually try hard exercise for themselves.

'Forcing people' should have been 'having people force themselves', too late to edit now.