I was thinking of if internal organs could recover. Or joints heal? I don’t ever remember reading about the after effects of weight loss. Lose weight and feel better. But that can’t wipe the slate clean can it?
Livers regenerate pretty quickly, arteries clear and hearts get stronger
There is a growing body of evidence to say metabolic damage is permanent though.
I’ll see if I can find the study, but basically, a woman who has been a healthy weight their entire life can maintain a weight of 10 stone by eating 2000 calories a day Where as a woman of the same height and build who has been obese will only need 1400 calories to maintain a weight of 10 stone (Numbers rounded up to explain the concept btw)