Eating disorders are also often comorbid with/manifest after sexual assault/abuse. Here is a random link, but this was something I actually learned in college in either a WOMS or PSYCH class, I forget which. Personally, i think that comparing anorexia or other body dysmorphia/eating disorders to an OCD may be a little simplistic. Studies have shown, for instance, that anorexics actually perceive their body as bigger than it really is (by studying their movement; anorexics will feel there is not enough room in a narrow corridor or passage for them to fit through, even though there physically is) - example article. 2 It seems an actual problem with incorrect perception as well as an obsession or compulsion. There is also an idea that anorexia and eating disorders may be influenced by/perhaps caused by a disruption in the gut flora and it's been hypothesized that fecal transplants may help alleviate the disorders...However this is very much a "bad feces could cause the disorder or the disorder could cause the disrupted feces" Here is the link to the reddit thread but it appears the original article has been taken down