 A Better Life with Dr. Sanjay Gupta. Over the years, we've talked so much about the Mediterranean diet and its health benefits. Now, one of the staples of eating this way is olive oil. But importantly, not all olive oils are created equal. There are a few important factors that determine how healthy your olive oil is going to be. Some of them you don't really have a lot of control over, the harvesting and the processing. But in general...