How has weight loss/weight gain affected your perception of self? Even those of us who believe that our identity is based on some spiritual, intangible essence must acknowledge that on a day-to-day basis, we are also something physical.
I doubt there are many of us who have stayed at around the same weight -- or even if you have, there must be other changes in appearance that you notice. How does the fact that your body can change affect the way you think of yourself as a complete entity? By losing weight, some of us believe that we can "become a different person." Do you feel like different people at different weights? Do you believe that there is a static "you" that has survived your struggle with your eating disorder, unchanged? What sense of self do you have, and how is it affected by your physical appearance?
You don't have to answer all of those questions. :) I'm just trying to get the brain juices flowing.