How to Build a Low Calorie Pizza

How can we build a good tasting low-calorie pizza? First it would help to understand the nutritional components of a pizza and where the calories come from. Consider the graph below: Here we see that the average pizza at fast food places consists mostly of carbs, then proteins, then fats. However, in terms of calories, the fats and carbs get the most pie. How then should we construct a low-calorie pizza? (In order of importance)

1. Make a thin crust
2. Go easy on the cheese and Sausage
3. Add vegetables and lean meats

And that should just about do it.