Olives are an unusual fruit because of their high fat content. Their most abundant fat is oleic acid, which may have several health benefits. They also contain 4–6% carbs, most of which consists of fiber Olives are a good source of vitamin E, iron, copper, and calcium. They may also contain high amounts of sodium if packaged in saltwater. Olives are particularly rich in antioxidants, including oleuropein, hydroxytyrosol, tyrosol, oleanolic acid, and quercetin Olives are very rich in antioxidants that may contribute to a variety of benefits, such as lower cholesterol and blood pressure. They may also reduce your risk of cancer and bone loss, but more research is necessary.