My DD (14) is quite severely overweight. She has always been tall and heavy. She was well over the 99th centile when she was born, and remained so through childhood - which was fine, as her weight and height were in keeping with one another. Now, though, she is over 16 stone (and is also 5 foot 10, so is still tall for her age and gender). She started binge-eating when XH and I divorced, and is evidently a comfort eater (whereas I stop eating when unhappy) - but has now got stuck in unhealthy patterns and can't seem to see a way out. When I say 'unhealthy patterns', I find endless wrappers stuffed under her bed, in her wardrobe, in her pillow cases - family packs of caramel slices, huge empty Doritos packets, 2 litre fizzy drink bottles, endless chocolate and sweets, Pringles, KFC boxes, etc, etc, etc. She has a modest monthly allowance from me, but it is not enough to fund a habit of this magnitude, so other girls are evidently either buying her food or giving her the money to buy it.
XH and I both provide healthy meals (we have never 'banned' particular foods, on the basis of 'a little bit of everything' is fine - so DD can't say that her binge-eating is a response to being deprived of anything). XH is 6' 3" and slim; the other DC, late teens, are tall and slim and always have been. I know it can help if mothers and daughters try to become healthy/lose weight together, but I am 5 foot 2, 6.5 stone, and extremely fit, so couldn't really afford to lose any weight or do anything further to increase my fitness. XH and I and the other DC eat healthily and exercise daily (not in an obsessive sort of way - just in that we all walk or cycle everywhere, swim regularly, and the other DC also play a lot of sport, just because they enjoy it). DD, though, won't do any of those things, even if they are presented as apparently 'fun' activities.
DD used to swim for miles (literally - she was in a competitive swimming team in Junior School) and play sport, but is now too self-conscious to do either. She makes excuses to evade Games at school, and says she is bullied for being fat. She suggested a 'boot camp' in summer to help her to kick start the process. We will do anything and pay anything that might help her to start - but does anyone have any advice at all?