thanks, i dont know you see because i could have counted my day as a green day i think as the tiny amount of tuna i had at lunch could be a hex B as well. I dont see why you can't do it because as long as your pizza does actually contain all the cheese i dont see what difference it makes if you count it then or eat a piece of cheese WITH the pizza, its still cheese...
though if you're having 4 hex portions of mozzerella surely that's like... 168g so as long as your pizza actually has that much cheese on then i'd say it's fine =D