My daughter is 14 and has been looking at extreme diets online, especially ones that genuinely seem to be encouraging an eating disorder (talks about green days and red days, with things like half a cucumber for lunch, half a red pepper, etc etc) I can't say I notice this actually in her life, as she is eating ok and can't say I've seen any kind of actual relevant problems coming through, but it's just the fact she is accessing such. Would you bring it up to her?