Increasing the intake of potassium-rich foods is associated with a significantly lower stroke risk.
Very few people are eating enough plants—see 98% of American Diets Potassium-Deficient. The banana listing reminds me of a similarly humorous finding about the levels of eyesight-saving nutrients; see Egg Industry Blind Spot. Bananas are also kind of pitiful antioxidant-wise (see Best Berries). Is a fruit a fruit, or should we really go out of our way to eat plants with the most antioxidants? See Anti-Inflammatory Antioxidants. This three-part video series ends with a surprising twist—the anti-inflammatory effects of potassium! Check out Potassium and Autoimmune Disease.
Also, be sure to check out my associated blog post for additional context: Do Vegans Get More Cavities?