I often wonder if EDs among assigned females aren't connected to gender issues in some cases.
I would say that a HUGE part of my ED has been down to my problems with my gender, a way of seizing control of an increasingly "wrong-shaped" body, reducing my female characteristics and creating a more androgynous look. I've also noticed that on the rare occasions when the media deigns to portray androgynous people, they are usually unbelievably waifish and skinny: slender females with tops that hardly need binding, svelte males with narrow shoulders and little muscle. Unthreatening. These kinds of images still have a huge hold over me: they present a kind of fantasy, the fantasy of acceptance as an androgyne in society. I could fit right in--all I have to do is get my weight down to 90 pounds. If I can't do that then my lack of acceptability is All My Fault.
I've had this battle with EDs that's been ongoing since I was 8 or 9. I have never had a formal diagnosis, but by 17 I fulfilled all the medical criteria for anorexia nervosa. I returned to that low weight several times throughout my adult life. (Before anyone makes the obvious comment--yeah, I know I look "normal" in the picture. Years of alternate starving and binging have shot my metabolism so now I'm huge.) I can well imagine that a lot of transpeople of all genders must go through similar disorders. I can only imagine the horrendous pressure that transwomen must feel to conform to current stereotypes of female attractiveness, and that surely must manifest in EDs in many TS women. My heart goes out to anyone in that situation.