What the evidence shows
A medium banana contains roughly 400–450 mg of potassium, an important mineral that helps regulate blood pressure by:
Promoting sodium excretion through the kidneys.
Helping blood vessels relax.
Supporting normal fluid balance in the body.
Higher potassium intake is associated with lower blood pressure, particularly in people who consume a lot of sodium. Major health organizations recommend getting potassium from foods such as bananas, beans, potatoes, leafy greens, and fruits.
Will one banana a day lower your blood pressure?
Possibly, but the effect is likely to be small on its own.
A single banana provides only about 9–12% of the daily potassium intake recommended for most adults. If the rest of the diet is high in sodium and low in fruits and vegetables, one banana is unlikely to make a dramatic difference.
The greatest blood-pressure benefits come from an overall dietary pattern, such as:
