I have a teenage vegetarian in the house, so we feature some non-meat menus each week:

Hummus & pitas
Pinto beans and cornbread
Both vegetarian and lowfat!

Make sure your pizza crust is whole wheat - the fiber is so good for your cholesterol and it takes more work for your body to get nutrition out of it. Make your pizza a gourmet style with fresh tomatoes and feta or goat cheese (if your kids will tolerate it). You use less cheese that way.