I'm in the midst of moving, so eating isn't going to involved barbecues. On other holidays, I've manage not to let food become the central point. I've planned what I will eat and how much, and then I follow the plan. I know that's easy to say and hard to do, but really, that's the only trick there is.
Oh, and I list every single thing I eat. There is no such thing as food that doesn't count.
Good luck to everyone!
Jay