Good old bananas are loaded with potassium—a macronutrient that helps control your blood pressure and keeps your nervous system operating at peak efficiency. Potassium also lowers your risk for stroke, according to research from the FDA. But if you’re like most women, you’re consuming only half the potassium your body needs. One banana packs 450 mg—about 10% of your daily potassium target—as well as fiber to keep your digestive system running smoothly.