Olive oil contains abundant amounts of oleic acid. Oleic acid is a type of monounsaturated fat that lowers cholesterol levels, which decreases the risk of a heart attack or stroke.
According to How Stuff Works, olive oil is comprised of between 55 to 80 percent oleic acid. The factors that influence this fluctuation include the type of soil in which the olives are grown and the kinds of olives that are used to make the oil.
Olive oil also contains vitamin E, the omega-6 fatty acid known as linoleic acid and the omega-3 fatty acid known as alpha linoleic acid.