Toh WL, Grace SA, Rossell SL, Castle DJ, Phillipou A. Body parts of clinical concern in anorexia nervosa versus body dysmorphic disorder: a cross-diagnostic comparison. Australasian Psychiatry. 2019 Apr 1:1039856219839477.

It is common for young people with anorexia nervosa to dislike parts of their body and it can be hard to know when they have co-occurring body dysmorphic disorder.  This article offers useful pointers to discern between the two.

https://journals.sagepub.com/doi/abs/10.1177/1039856219839477