I am obese, years of yoyo dieting have seen me range from a size 10. To a size 26, I have tried pills, shakes, hypnotherapy and acupuncture, it was only after Dave passed away and I had to develop new coping strategies that I found I could regain some measure of control.
I have no clinical reason but a long history of psychological food dependence.
Therapy has helped now I have time to put my own needs first. I was never lazy always active walking lots regardless of my size, now gym or swim drive days a week.
There is likely to be a larger number of people for whom a fault in the leptin / ghrelin balance means appetite ,hunger and satiation are out of synch giving the feeling of always being hungry. Testing is expensive but there is some suggestion that bad habits in childhood can cause this to develop rather than it being genetic. fat adults creating children who will always have to battle with their food intake.
The best parallel is the early onset of type two diabetes which is linked to lifestyle.
I am not sure being rude and judgmental helps, as a lot of overeating is linked to low self worth. Acceptance however just normalises the abnormal. I do know if it is classed as a disease it will open the doors to research funding and hopefully effective non surgical treatments.