I've been very interested in this thread -- many, many good points.
I, personally, find that dieting/lifestyle change is my way of controlling my eating disorder -- so I can positively say it is "the medication that controls my disease", not a disease in itself. It makes me aware of my faults, makes me take a step back and decide if something I eat is for an emotional fix or for actual nutrition, etc. Although counting calories can become an obsession for me, I'm trying to put food "in it's place" and not obsess so much about the things I can't have and enjoy the things I can.
I think you create an eating disorder out of food control -- either loss of control of what you consume or too strict control over it -- but it's all a matter of the "happy medium" needed to lose weight in a healthy way, with no rigid restraints.