The link below is from an ABC News Health article about a recent study from France that shows a correlation between reduced stroke risk and high consumption of extra virgin olive oil. They studied 7,625 participants over a period of 5.25 years. While they accounted for other dietary factors they mention you cannot separate the fact that extra virgin olive oil makes other foods that are healthy for you taste better so you eat more of them like fruits, vegetable, legumes, and fish. They found that the higher the consumption of extra virgin olive oil the lower the risk of stroke. The study did not distinguish if the olive oil consumed was specifically extra virgin but they noted all olive oil sold in France is extra virgin.

http://abcnews.go.com/Health/CardiacHealth/olive-oil-protects-stroke/story?id=13849901