Salaam.
I took a quick look at this thread, saw my comment from a year ago being quoted, so I thought maybe I can bring some more insight.
Wa'alaikumsalam
To be honest, your post in that thread is my inspiration to make this thread.
One advice which me and other boys received when I was teen was "When you are looking for life partner, you don't have to choose beautiful woman, but choose a woman who is good in character and personality". In the beginning we ignored this advice. But later we see a reality, there is a strict competition to get a beautiful woman. So, rather than lose in this competition and never get anyone, we changed our view and started learn to see a woman not from physical beauty. The girls know it, and they feel safe.
Actually the girls in my place can feel inferior to other girls who are more beautiful. But it doesn't make them feel 'eliminated'. They still believe that there's must be guys who will come to them too, and they are right. Yes, they believe that personality and their characteris far more superior than their physical looks.
And there is another difference. Teen girls in my place are not obsessed to have boyfriend. They do not think "If I don't have boyfriend, people will regard me as a girl who unwanted by the boys".
Seem like the girls in your place are under pressure to become a girl who really matched with criteria that made by the boys. I begin to understand if they choose extreme way to being slim, vomit the food that they have eaten.
Yeah, as a man who have problem with weight, I know, there's always temptation in diet. Only those who mentally strong who can defeat this temptation. And they are not mentally strong.