Here is a very specific counter example I heard recently: a woman contestant in one of those weight loss shows, overweight all her life, all her life on yo yo diets, doctors told her to lose weight if she wants kids since her hormons were messed up. Lost 200lbs in one year by dieting and exercising 6 hours a day, felt miserable, lost her period completely, doctors told her her body is behaving as if she was anorexic so she still could not get kids and of course unless she continued dieting kept gaining weight. So the images of people looking like concentration camp survivors does not mean much - in this one case the person finally looked normal, but her body did not work normal anymore.

If anybody is interested: https://podcasts.apple.com/us/podcast/jacqui-mccoy/id1440334...