Potassium and Blood Pressure: Daily Needs and Top Foods

Potassium and blood pressure are closely linked: potassium helps your body get rid of extra sodium through urine and eases tension in blood vessel walls. The NIH sets an adequate intake of 3,400 mg a day for adult men and 2,600 mg for adult women, and most of it can come from fruits, vegetables, beans and dairy.

Key takeaways

• Potassium balances sodium. The more potassium you eat, the more sodium you lose through urine, according to the American Heart Association.
• Adult women need about 2,600 mg a day and adult men about 3,400 mg. The AHA suggests 3,500 to 5,000 mg a day, ideally from food, for adults managing their blood pressure.
• Dried apricots, lentils, acorn squash, potatoes, beans, bananas, milk and yogurt are among the richest everyday sources.
• Most adults fall short. US survey data show women average about 2,320 mg a day and men about 3,016 mg.
• If you have kidney disease or take ACE inhibitors, ARBs or potassium-sparing diuretics, talk to your doctor before eating more potassium or using salt substitutes.

How does potassium affect blood pressure?

Sodium and potassium work as a pair. Too much sodium makes the body hold on to extra fluid, which raises the pressure inside your arteries. Potassium pushes in the other direction: the American Heart Association explains that the more potassium you eat, the more sodium you lose through urine, and that potassium also helps ease tension in blood vessel walls.

The research lines up with this. The NIH Office of Dietary Supplements notes that low potassium intake is linked to a higher risk of hypertension, especially when sodium intake is also high. That is why advice on potassium almost always comes with advice to cut back on salt.

How much potassium do you need per day?

The NIH Office of Dietary Supplements lists these Adequate Intakes (AIs) for adults:

• Men 19 and older: 3,400 mg per day
• Women 19 and older: 2,600 mg per day
• During pregnancy: 2,900 mg per day
• While breastfeeding: 2,800 mg per day

For adults with elevated or high readings, the American Heart Association recommends 3,500 to 5,000 mg of potassium daily, ideally from diet. These targets do not apply to people whose bodies cannot clear potassium normally because of a medical condition or medication. If you are not sure where your readings sit, our guide to what your blood pressure numbers mean walks through each category.

Food choices are the foundation, and some people also look for extra support. Alistrol blood pressure support is a herbal formula with daikon seed, holly leaf, aged garlic, hawthorn berry and fulvic minerals that helps maintain healthy blood pressure as part of a healthy diet. It is not a potassium supplement and does not replace prescribed medication, so keep taking your medicines and check with your doctor first. It is currently available with a Buy 2 Get 1 Free offer.

What foods are high in potassium?

Many common foods are rich in potassium. The table below uses figures from the NIH Office of Dietary Supplements, based on USDA data. The percentages use the US Daily Value (DV) of 4,700 mg.

Notice that beans, lentils, squash and potatoes beat the famous banana. Refined foods such as white bread and white rice are low in potassium, so whole, minimally processed foods are the easiest way to raise your intake.

Does the DASH diet help you get enough potassium?

Yes. The DASH (Dietary Approaches to Stop Hypertension) eating plan is built around fruits, vegetables, whole grains, low-fat dairy and fish, and the NIH reports it provides about three times the potassium of the average American diet. In research, the DASH pattern lowered systolic blood pressure by an average of 5.5 mmHg and diastolic by 3.0 mmHg.

DASH also supplies magnesium and calcium, so its effect cannot be credited to potassium alone. That is a good reminder to focus on the whole eating pattern rather than one nutrient. For more everyday habits that work alongside DASH, see 9 research-backed ways to lower blood pressure naturally.

How can you get more potassium every day?

1. Add beans or lentils to soups, salads, chili or pasta sauce a few times a week.
2. Choose a potato or squash side instead of white rice or white bread.
3. Snack on fruit, such as a banana, an orange or a small handful of dried apricots or raisins (dried fruit is also high in sugar, so keep portions small).
4. Include milk or yogurt once or twice a day if dairy suits you.
5. Fill half your plate with vegetables, including leafy greens, tomatoes and broccoli.
6. Read the Nutrition Facts table. Potassium is now listed on food labels in both Canada and the US, which makes comparing products easy.
7. Cut sodium at the same time by cooking at home more often and limiting processed and restaurant foods.

Who should be careful with potassium?

For most healthy people, the kidneys remove extra potassium from food without trouble. For some people, though, potassium can build up in the blood (hyperkalemia), which can affect the heart. The NIH Office of Dietary Supplements lists these higher-risk groups:

• People with chronic kidney disease, whose kidneys may not clear potassium well.
• People taking ACE inhibitors (such as lisinopril) or ARBs (such as losartan), common blood pressure medicines that reduce how much potassium leaves in urine.
• People taking potassium-sparing diuretics such as amiloride or spironolactone.
• People with type 1 diabetes, congestive heart failure, adrenal insufficiency or liver disease.

Salt substitutes deserve special attention. Many replace some or all of the sodium chloride with potassium chloride and can contain roughly 440 to 2,800 mg of potassium per teaspoon. If you are in any group above, ask your doctor, pharmacist or a registered dietitian before using one or adding a potassium supplement, and never change a prescribed medication on your own.

The bottom line on potassium and blood pressure

Eating more potassium-rich whole foods while cutting back on sodium is one of the simplest, best-supported diet changes for heart health. Aim for the daily targets above through beans, vegetables, fruit and dairy, and keep checking your progress with a home monitor. Our step-by-step guide on how to take blood pressure at home accurately can help you track how your numbers respond.

Frequently asked questions

Do bananas help lower blood pressure?

A medium banana has about 422 mg of potassium, roughly 9% of the Daily Value, so it can be one helpful part of a potassium-rich diet. No single food changes blood pressure on its own; the overall eating pattern, with plenty of fruits and vegetables and less sodium, matters most.

Should I take a potassium supplement for blood pressure?

Try to get potassium from food first. The American Heart Association says a clinician may recommend a moderate-dose supplement for some adults, but check with a healthcare professional before taking one, especially if you have kidney disease or take blood pressure medication.

Are potassium salt substitutes safe?

Salt substitutes that use potassium chloride can help cut sodium, but they can contain about 440 to 2,800 mg of potassium per teaspoon. People with kidney disease or who take ACE inhibitors, ARBs or potassium-sparing diuretics should ask their doctor before using them.

What are the signs of too much potassium?

The American Heart Association lists nausea, vomiting, irregular heartbeat, fainting and muscle weakness, although levels often must be very high before symptoms appear. A blood test is the only reliable way to know your potassium level, so ask your doctor if you are at risk.

Sources

• NIH Office of Dietary Supplements: Potassium Fact Sheet for Health Professionals
• American Heart Association: How Potassium Can Help Control High Blood Pressure

This article is general information, not medical advice. Talk to your doctor or pharmacist before starting any supplement, especially if you take blood pressure medication, and never stop or change a prescribed medication without medical advice.