How much potassium do I need a day?

US adequate intake is 3,400 mg a day for adult men and 2,600 mg for adult women. Average intake is well below both, and fewer than 3% of US adults meet the target.

What foods are highest in potassium?

Potatoes with skin, beans, lentils, spinach, beet greens, avocado, yogurt, salmon and dried apricots all beat a banana per serving. Bananas are famous for this rather than exceptional at it, at about 420 mg each.

Does potassium lower blood pressure?

Increasing dietary potassium reduces blood pressure, particularly in people with hypertension and high sodium intake. The sodium-to-potassium ratio predicts cardiovascular outcomes better than either figure alone.

Potassium: the easier half of the blood pressure equation

Under 3% of US adults hit the potassium target. Raising it is often more achievable than cutting sodium further, and it works on the same mechanism from the other side.

The AIM teamNovember 3, 20264 min read

Sodium gets the attention. Potassium is the other half of the same mechanism, almost nobody hits the target, and raising it is usually easier than cutting sodium further.

The gap

Adequate intake is 3,400 mg a day for men, 2,600 mg for women.

Fewer than 3% of US adults reach it. That is a wider shortfall than fiber, which at least gets mentioned.

Why the ratio matters more than either number

Sodium and potassium work against each other in blood pressure regulation. Sodium promotes fluid retention and raises pressure; potassium promotes sodium excretion and relaxes vessel walls.

Which is why the sodium-to-potassium ratio predicts cardiovascular outcomes better than either figure on its own. A day with 3,000 mg of sodium and 4,000 mg of potassium is a better day than one with 2,000 mg of sodium and 1,500 mg of potassium, even though the second looks better on the sodium line.

That reframes the problem usefully. Cutting sodium is hard, 70% of it is added before you buy the food. Adding potassium is a matter of what you put on the plate, which you control.

It is not really about bananas

Bananas are the famous source and not a particularly strong one. Per serving:

Food	Potassium
Baked potato with skin	925 mg
Beet greens, 1 cup cooked	1,300 mg
White beans, 1 cup	1,000 mg
Lentils, 1 cup	730 mg
Spinach, 1 cup cooked	840 mg
Avocado, one	700 mg
Salmon, 6 oz	800 mg
Yogurt, 1 cup	570 mg
Dried apricots, ½ cup	750 mg
Banana	420 mg

A baked potato is more than two bananas. Beet greens are three.

Why supplements are not the answer

Potassium supplements sold over the counter are capped at about 99 mg per dose, around 3% of the daily target, specifically because a large fast dose of potassium can cause dangerous heart rhythm problems.

Food does not have this issue. The potassium arrives slowly, with fiber and water, and the kidneys manage it easily. This is a nutrient where "get it from food" is not a preference but close to a requirement.

One exception worth flagging: people with kidney disease, and people on ACE inhibitors, ARBs or potassium-sparing diuretics, may need to limit potassium. If that is you, this article does not apply and your doctor's number does.

Tracking it

Potassium is one of the fourteen nutrients AIM estimates on every meal, and it is a good candidate for pinning to your meal cards if blood pressure is something you are actively working on.

It is also the clearest example of why a tracker that only shows calories and three macros is limiting. The nutrient with one of the widest intake gaps in the population is not something you can see at all in an app that stops at fat.

Common questions

How much potassium do I need a day?: US adequate intake is 3,400 mg a day for adult men and 2,600 mg for adult women. Average intake is well below both, and fewer than 3% of US adults meet the target.
What foods are highest in potassium?: Potatoes with skin, beans, lentils, spinach, beet greens, avocado, yogurt, salmon and dried apricots all beat a banana per serving. Bananas are famous for this rather than exceptional at it, at about 420 mg each.
Does potassium lower blood pressure?: Increasing dietary potassium reduces blood pressure, particularly in people with hypertension and high sodium intake. The sodium-to-potassium ratio predicts cardiovascular outcomes better than either figure alone.