Oh I love olives... I usually have a couple and snack on from time to time. I am careful because me and olives do have a history....
Food of the Week . . . Olives
Did you know that the monounsaturated fats, vitamin E and polyphenols found in olives help provide anti-inflammatory protection and reduce the severity of the symptoms of rheumatoid arthritis, asthma and osteoarthritis? Olive oil's monounsaturated fats have also been found to lower blood pressure and help reduce the risk of heart disease and stroke, while its antioxidants and polyphenols help balance cholesterol levels, boost the immune system and protect against some cancers. Vitamin E is the body's primary fat-soluble antioxidant that helps protect cells from the ravages of free radical activity. The one caution with eating olives is that they are usually high in salt content. If salt is problematic for you, rinse them off under cold running water to remove some of the salt before enjoying them.
http://whfoods.org/genpage.php?tname=foodspice&dbid=46