I think the vast majority of people who are overweight/obese do not have a psychological issue (food addiction, disordered eating) which causes this
Its extremely easy to eat too much, a little bit here, a little bit there, going out for dinner, the odd takeaway, calorie dense food, upfs which essentially mainline calories into us. Humans are designed to seek out calorific and fatty foods, its a survival mechanism and being so clever humans have designed a society where that is easy to do.
Its suits the narrative to claim there are special reasons, and there will be these issues for some but not for the vast majority
Is there something particular about the UK and US psyche that means we have more psychological issues than other countries where they dont have as big an issue with obesity (although those countries are also increasing with the problem). No, its as someone said above like a social contagion/environmental issue which makes being overweight ok. Im a victim (so to speak) of this as much as anyone else.
Im also amazed at the number of people who have come onto this thread and immediately started getting angry and defensive claiming that fat people are being called or viewed as 'disgusting'. I havent seen one post to that effect. Its impossible to discuss this with that sort of attitude.