I do know for me, when I worked on the underlying causes of my anorexia & am now living in a safe environment (i was 33 years in a bad marriage) that grew horrible the last 13 years of that time. Resolving those issues & having a wonderful new life to focus on has been critical to getting through the anorexia. I still dont eat 3 full meals a day but eat healthy & maintain healthy weight now.
It is possible....but it took years of good therapy to work through those underlying issues