I see clear parallels between fatness and thinness. I believe that out-of-control eating may work in the same way as out-of-control starving, as a defence mechanism against the world, a place to retreat when it all gets too much.
The plus-size sisterhood can be frightening. Among the messages I received (only from women, and mostly anonymous) I was called a skinny bitch, a body fascist, and a fat-nazi. I was informed that men "love something to grab on to", and that "curves" are sexier than skeletons. (Woolf, 2013).
Write something about yourself. No need to be fancy, just an overview.