Pistachios are rich in potassium, phosphorus (helps build bones and teeth) and magnesium, and are also a good source of vitamin B6 (aids protein metabolism and absorption) and thiamine (enhances energy and promotes normal appetite). These nuts also have a relatively low calorie value when compared to other nuts and are cholesterol free, high in fiber and low in saturated fat. Like most other nuts, pistachios can also cut heart disease risk. The high monounsaturated fat content may actually lower cholesterol levels in the blood. Pistachios also contain antioxidants in the form of phytochemicals. These plant nutrients have been associated with a decreased risk for developing chronic diseases, like cancer.