Hey BL! Sorry you're having such a tough time with your friends. Are these the same ones that took you out for your b-day?
Well, next week, I think you should make a kick-butt lunch and really show them you can eat good food. And then, don't tell them not only is it good, but it's good for you too until they've eaten! LOL I wonder if they'll even notice....
Maybe you can get them to change it to a potluck type of thing, and then you can always bring yourself something safe to eat? Of course, you could always bring your own food anyway even now. If that seems like you'll be rude, I say so what. They don't seem to have been all that polite to you, IMO.