I love pizza, but since I make it myself, it is
low on calories (little oil in dough,
low fat cheese, lost of veggies, wholemeal flour). I only eat half, and if I am still hungry, I eat a side salad, with lemon juice instead of dressing. Look up the healthy food guide for fast, easy and low calorie recipes.
Another, more radical approach is: no more carbs. Eat lots of veggies, one portion of fruit only, one handful of raw nuts, low fat dairy, high fat fish, lean meat.