Why buy extra-virgin olive oil: Olive oil is a monounsaturated fat and research shows that monounsaturated fats help keep “bad” LDL cholesterol low and boost levels of “good” HDL cholesterol. In addition, extra-virgin olive oil is high in antioxidants called polyphenols that have been linked to heart health. “Pure” olive oil (i.e., not virgin) doesn’t contain these “bonus” antioxidants.