Olives, and the extra-virgin oil that is made from a single pressing of the fruit, contain many of the antioxidants that are thought to protect against the oxidation of LDL cholesterol compounds. They also are high in monounsaturated fatty acids, which are called "the healing fats" because they lower the effects of "bad" cholesterol while raising "good" cholesterol levels. High in vitamin E, olive oil also is thought to protect against colon cancer, and it is helpful in fighting gastritis and other stomach ailments.