curiousv:
I think the "point of no return" is mostly psychological, it's not about an exact weight and height. There is nothing physically stopping anyone from just starting to eat less, or exercise more, or seek help (if too big to actually exercise).
There are some who got almost immobile and then lost some weight for convenience's sake (despite still remaining feedees), and there are some who feel they are past the point of no return at much smaller sizes than that, because they feel they lost all the will to try and rein in their gluttony.
interesting thanks for the insight