For me, my anorexia come from stress, depression, & it even was initially triggered by the medication Prozac.....then another time a trauma I went through.

Therapy to help me process the situations that caused the anorexia were the most important part of therapy.

The ED treatment center didn't work because they tried to cram in my head that anorexia was all about body image.....well in my case it wasn't.....but they only handle people with what is their text book reasoning for the ED & had no idea how to help through the depression & when I was told to find an ED treatment facility after going through the trauma & was dealing with PTSD, they admitted they weren't capable of treating ED caused by such things.

Therapy that works on the issues that are causing the ED are definitely the only thing that can possibly work IMO.