I don't see anything wrong with having pizza -- as long as it is considered a "cheat meal" every once in a while if you are a very strict dieter. Many of us on this board are extremely tight with our diets -- we need to be in order to obtain the gains we seek. However, I don't see anything wrong with cheating once a week, be it pizza or whatever it is you desire. This not only helps to kick start your metabolism into high gear (I can actually feel my body temperature rise when I do this) but it also help curve those cravings we all get. So go ahead and have your pizza -- just make sure you don't gorge yourself and that it is treated in a manner that is consistent with its nature (cheating).