You know what food should be healthy? Pizza. It's part bread, part dairy, and the other part being either fruit if you're a biologist or vegetable if you're a bastard. Yet somehow, it's not healthy at all. Pizza dough is made with sugar, pizza sauce is made with various seasonings, oils, and still more sugar, and cheese has loads of fat, saturated fat and cholesterol. Also, somehow grease is involved. It's like someone has taken a healthy piece of food such as an apple and turned it into a dutch apple pie, and somehow America has been tricked into accepting the pizza pie as a proper meal item while all the other pies are still desserts. You don't eat a slice or two of Pecan Pie for supper.
Pizza is mostly empty calories. What's more, if you have any discretionary calories at the end of the day or week, you don't get very much mileage out of a pizza when some slices have as much as 350 calories. It's not filling and it's gone in too few bites, so you won't be satisfied after just one slice. Lets not forget what goes with pizza: soda. Soda is all empty calories and its bad for your teeth. So what happens after you engorge on 3 slices of pizza and 2 glasses of soda plus some buttery garlic bread? Well, I'm pretty sure no one has sex after a meal like that.
