First I apologize if this gets too technical. I usually try to provide information in some hopefully entertaining way but sometimes I have to dig into the details because they are important.
An article in the current New England Journal of Medicine has this article.
Primary Prevention of Cardiovascular Disease with a Mediterranean Diet Supplemented with Extra-Virgin Olive Oil or Nuts
This demands a bit of background since we are a liver disease group and the report is measuring cardiovascular disease. There are studies of olive oil and liver disease but generally they are not as long or big as this one and many studies lack the rigor. You should also remember that liver disease is the master of co-morbidity. It is generally not understood that cardiovascular disease is the number one cause of death related to cirrhosis.