Kiju said:
Well, when you think about it...
Pizza consists of a lot of healthy things: cheese, bread products, vegetables, and meat (usually).
The only thing making it unhealthy is the grease and the oils in the sauce. Unless I'm missing something...
No disrespect but you have a lot to learn:
Cheese: extremely fattening, 40 to 50% fat
Dough: Especially white flour dough, very fattening (the carbohydrates bind the fat making it easy to be stored by the body)
Meat: Very fattening, even the "light" versions
These ingredients are all well known to be major contributors to becoming fat. The oils and sauces are of course also important, but make no mistake that the real health issue comes from a ton of cheese and meat on a baked bread product. That's enough calories right there for nearly the rest of the day.