Tomato

Even a cheese pizza can be somewhat more nutritious than you expect. This is because of the tomato sauce. First you must know that the tomato is a very healthy ingredient.
The tomato is an excellent source of vitamin C and vitamin A. One medium tomato provides about 40% of the recommended daily allowance of vitamin c and 20% of your recommended daily allowance of vitamin a.

Aside from these increase in your daily vitamin levels it is also a good source of cancer fighting antioxidant Lycopene

Cooking the tomato for the sauce does not seem to have much of a negative effect because tomatoes are lipophilic, which means their nutritional value is actually increased by being cooked in some fat. Essentially cooked tomatoes might be more beneficial to your health than a raw tomato would.