"perhaps, these days, it's easier to get to the point of no return with overeating?"
I think the stigma is actually greater now, I'm really interested in vintage fashion etc. If you look through old beauty magazines especially if you go back to the 20's-40's you will see weight loss adverts, but you also see weight gain ones. Can you imagine those nowadays??
Back then diet was fucking awful, old recipes are packed full of lard etc and fizzy drinks were prescribed by doctors! They got more exercise which helped, but there also wasn't the same skinny worship we have now, and while the icons of the day were usually very slim there also weren't magazines devoted to shaming fat celebs.
Nowadays we are pushed heavily towards an unrealistic ideal with photoshopping of photos etc while simultaneously reminded of how gross and shameful extra weight is.
If you are larger you are constantly reduced to just your weight. Look at those wonderful shock news reports on the "obesity epidemic" which is always endless footage of fat people walking down streets but with no faces. If you are comfort eating/binge eating and then confronted by that it is so easy to just think, fuck it, can't beat this, may as well cheer myself up with some food.
I remember reading that binge eating is also meant to generate an endorphin rush, in a way that eating calmly doesn't. Which heightens the guilt cycle, because you then know that binging again will make you feel happier.