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Bananas also contain small amounts of magnesium, another mineral that supports healthy blood vessels and circulation. Together, potassium and magnesium help promote smooth muscle function within blood vessel walls.
The American Heart Association notes that diets emphasizing fruits and vegetables rich in potassium are associated with a lower risk of heart-related concerns. Bananas are also naturally low in fat, contain no cholesterol, and require no processing, making them a heart-friendly alternative to many packaged snacks.