Some foods should have their own food group.
Chocolate, for example.
Or bacon. Bacon definitely deserves to be in it's own group.
Pizza covers all 4 food groups, if you get the right kind - meat, bread, veggie and dairy.
Wine is technically in the fruits and veggies group. Beer and most spirits are technically in the starchy foods group.
I'm just saying that a well balanced meal might consist of pizza, with bacon as one of your toppings, a beer, and possibly some chocolate for dessert.