I would say north of 75%. There will be a few outliers of people that started out thin and one got fat. A girl I knew from college is on that path. Always thin. She's been with the same guy forever, fit dude. Would bump into them every now and then when out. Haven't seen them for like 2 years. Other day I'm at a party, this fat girl comes up to me like she knows me, no fucking clue it is the formerly thin girl until I see the boyfriend come up who is still fit and looks like a human. She was completely unrecognizable. I wanted to him to run and get away while he still can.