Margherita is a type of pizza derived from a proper name, so it should be capitalized. It would also be capitalized If it were considered a brand name.
It is your preference. If you are on diet, you want to avoid cholesterol, saturated fats etc. But the point of this article is to avoid using oil, not cheese.
Pizza can spoil if you leave it out for too long, just like any other perishable food. Food safety experts say you’re relatively unlikely to get sick from eating a...