mostly accurate, but it overstates the effect of bananas on blood pressure.

 

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:

Eating more fruits and vegetables.
Reducing excess sodium.
Maintaining a healthy weight.
Exercising regularly.
Limiting excessive alcohol intake.
The gut-health claim

The article’s discussion of fiber and resistant starch is plausible. Bananas, especially slightly green ones, contain resistant starch that can support beneficial gut bacteria. There is growing evidence linking gut health and cardiovascular health, but the direct effect on blood pressure is still being studied and is not as well established as the potassium effect.

Safety considerations

For most healthy people, eating one banana daily is safe and nutritious.

However, caution is warranted for:

People with advanced kidney disease.
People taking medications that can increase potassium levels, such as certain ACE inhibitors, ARBs, or potassium-sparing diuretics.
Anyone who has been specifically advised by a healthcare professional to limit potassium intake.
Bottom line

A banana a day is a healthy habit for most people and may contribute modestly to better blood pressure control because of its potassium, fiber, and other nutrients. However, it is not a treatment for hypertension, and its benefits are greatest when it is part of an overall heart-healthy lifestyle rather than relied upon as a standalone solution.