Olive oil is believed to have a protective effect against a variety of cancers,including breast cancer, prostate cancer endometrium and digestive track cancer. It also is extremely high on oleic acid which is used to reduce blood pressure.
And if that was not enough to convince you of olive oil health benefits, olive oil also has a higher proportion of monounsaturated fats than animal fat (butter). Studies have indicated that if you replace saturated fats with monounsaturated fats you can lower your risk of coronary heart disease.
And dont forget that olive oil is naturally, cholesterol, sodium, sugar and carbohydrate free!