Potassium is an important nutrient for many body processes. Bananas are a well-known source of potassium, but many other foods contain just as much — if not more — of this nutrient. Potassium is an electrolyte that helps regulate fluid and blood levels in the body. Many fruits and vegetables are excellent sources of potassium. Meat, milk, yogurt, and nuts are also good sources. According to the Centers for Disease Control and Prevention (CDC), a diet high in potassium and low in sodium — an electrolyte in table salt and processed foods — can lower blood pressure and reduce the...