I have three things that help me stay on track:
1) My twin sister is dieting with me. We keep each other accountable
2) Posting here, of COURSE
3) I'm a big (read: galazy-sized) comics fan, so I tape a bunch of pictures of frowning superheroes on the fridge/cupboards/doors to my apartment. (My icon is actually the picture I use for the fridge haha)
For one thing it makes me smile (I think I'm hilarious, whether or not I actually am... well that's neither here nor there) and for another it makes it impossible to slip up and forget. If I'm going to cheat, it has to be with Captain America staring disapprovingly at me from the cupboard.