I also have an ED along with bipolar - I don't actually know which one is worse or *feeds* the other to an extent. So my diet is completely whack. I am trying to eat more 'healthy' foods though and at least get some nutrients.

As Christina said above with carbs and sugar - they make me depressed as all hell. But it could be the ED there too.

Exercise definitely can help mood, when you have the motivation to do so. As we all know, this can be nearly impossible sometimes. Sorry I'm not much help..