I ask myself this all the time...I know why it started when I was 14 but I was better from like ages 20-24 and then relapsed until now (a year and a half or so). I tried to understand why this happened to me... I miss eating like a normal person. It was great to be free of an eating disorder for so many years (without even really trying).
Do you think you know the cause of your ED?
Do you think it even matters to know the cause or to just deal with the symptoms?