Foods High in Potassium: A Practical Guide with Servings and Amounts

The Adequate Intake for potassium set by the National Academies is 3,400 mg per day for adult men and 2,600 mg per day for adult women, yet NHANES data show that fewer than 3 percent of American adults meet that target. The shortfall matters because higher potassium intake is associated with lower blood pressure, reduced stroke risk, and slower bone loss. This guide covers the evidence, the foods that deliver the most potassium per serving, the potassium-to-sodium ratio, and how to build a day of eating that actually hits the target.

Why potassium matters

Potassium is the main intracellular cation. It maintains cell membrane potential, drives nerve conduction and muscle contraction, and buffers the blood-pressure-raising effect of sodium. The kidneys tightly regulate serum potassium between 3.5 and 5.0 mmol per L, excreting the excess when intake is high and conserving it when intake is low. Healthy kidneys normally excrete large potassium loads from food efficiently, but kidney disease and certain medications (ACE inhibitors, ARBs, potassium-sparing diuretics, aldosterone antagonists) can impair that excretion, which is why potassium restriction is a hallmark of renal diets and individualized medical advice.

The 2019 National Academies report that established the current Adequate Intake cited evidence that higher potassium intake reduces blood pressure, sodium sensitivity, and risk of kidney stones, and may reduce bone loss. The Adequate Intake was set at the level needed to lower blood pressure, reduce sodium sensitivity, and reduce the risk of kidney stones.

The evidence: DASH and meta-analyses

The DASH trial, published in the New England Journal of Medicine in 1997 by Appel and colleagues, randomized 459 adults to one of three diets for 8 weeks. The DASH diet, rich in fruits, vegetables, and low-fat dairy and delivering about 4,400 mg of potassium per day, reduced systolic blood pressure by 5.5 mm Hg and diastolic by 3.0 mm Hg compared with the control diet. The effect was largest in hypertensive participants, who saw an 11 mm Hg drop in systolic pressure.

A 2017 meta-analysis by Filippini and colleagues in the Journal of the American Heart Association pooled 21 trials and found that higher potassium intake lowered systolic blood pressure by 3 to 5 mm Hg and diastolic by 1 to 3 mm Hg, with the effect larger in hypertensive participants and in those with high sodium intake. A 2017 meta-analysis by Cappuccio and colleagues in the same journal pooled 24 cohorts and found that higher potassium intake was associated with a 24 percent lower risk of stroke.

The mechanism is twofold. Potassium increases urinary sodium excretion, which reduces blood volume and pressure. Potassium also directly relaxes vascular smooth muscle through effects on membrane potential and endothelial function. The blood pressure effect is largest when sodium intake is high, which is why the potassium-to-sodium ratio matters more than either alone.

The potassium-to-sodium ratio

No official guideline sets a potassium-to-sodium ratio target: the 2019 National Academies report established Adequate Intakes for potassium and a Chronic Disease Risk Reduction intake for sodium, not a ratio. What the research shows is direction. A 2011 study by Cook and colleagues in the Archives of Internal Medicine found that a ratio higher in potassium predicted lower cardiovascular mortality more strongly than either electrolyte alone, and the typical American diet sits far on the sodium-heavy side of that balance. The practical way to move the ratio is the same either way: eat more potassium-rich whole foods and eat less sodium.

Two ways to improve the ratio: eat more potassium (the focus of this guide) and eat less sodium (covered in our Sodium Reduction Guide). Use the Potassium Calculator and Sodium Calculator to estimate both, and the Electrolyte Balance Calculator to track the ratio. See also our Sodium-Potassium Ratio guide for the full picture.

Top food sources with exact mg per serving

Potassium values below are from the USDA FoodData Central database and reflect typical serving sizes. Note that potassium content varies with variety, soil, and growing conditions, so treat these as averages.

Vegetables

• White potato, medium baked with skin: 926 mg
• Sweet potato, medium baked: 542 mg
• Spinach, 1 cup cooked: 839 mg
• Swiss chard, 1 cup cooked: 961 mg
• Beet greens, 1 cup cooked: 1,309 mg
• Acorn squash, 1 cup cooked: 896 mg
• Avocado, 1 medium Hass: 708 mg
• Broccoli, 1 cup cooked: 457 mg
• Brussels sprouts, 1 cup cooked: 495 mg
• Tomato sauce, 1 cup: 728 mg
• Pumpkin, canned, 1 cup: 564 mg
• Mushrooms, portabella, 1 medium grilled: 484 mg

Beans and legumes

• White beans, 1 cup cooked: 1,189 mg
• Lima beans, 1 cup cooked: 955 mg
• Edamame, 1 cup shelled: 676 mg
• Lentils, 1 cup cooked: 731 mg
• Black beans, 1 cup cooked: 611 mg
• Chickpeas, 1 cup cooked: 477 mg
• Pinto beans, 1 cup cooked: 646 mg

Fruits

• Banana, 1 medium: 422 mg
• Cantaloupe, 1 cup cubed: 427 mg
• Honeydew melon, 1 cup cubed: 388 mg
• Orange, 1 medium: 237 mg
• Orange juice, 1 cup: 496 mg
• Avocado, 1 medium: 708 mg (yes, a fruit)
• Papaya, 1 cup cubed: 264 mg
• Dried apricots, half cup: 756 mg
• Raisins, half cup: 598 mg
• Pomegranate, 1 whole: 666 mg
• Kiwi, 1 medium: 215 mg

Fish and seafood

• Halibut, 3 oz cooked: 449 mg
• Yellowfin tuna, 3 oz cooked: 484 mg
• Salmon, 3 oz cooked: 363 mg
• Cod, 3 oz cooked: 299 mg
• Clams, 3 oz canned: 534 mg

Dairy and alternatives

• Plain yogurt, 1 cup: 573 mg
• Milk, 1 cup: 366 mg
• Soy milk, 1 cup: 318 mg
• Cottage cheese, 1 cup: 322 mg

Nuts and seeds

• Pistachios, 1 oz: 295 mg
• Almonds, 1 oz: 207 mg
• Sunflower seeds, 1 oz: 186 mg
• Pumpkin seeds, 1 oz: 223 mg
• Peanuts, 1 oz: 200 mg

The surprise: potatoes vs bananas

The banana is famous as a potassium food, but it is not actually the best source. A medium banana has 422 mg. A medium baked white potato with skin has 926 mg, more than double. A cup of cooked white beans has 1,189 mg, nearly triple. A cup of cooked beet greens has 1,309 mg, more than triple. The banana's reputation comes from convenience and marketing, not from being the richest source. If you want to maximize potassium per calorie and per dollar, potatoes, beans, and leafy greens beat bananas by a wide margin.

Bioavailability and cooking losses

Potassium leaches into cooking water. Boiling potatoes can reduce potassium by 20 to 50 percent if the water is discarded; baking, roasting, and microwaving preserve it. Boiling spinach and discarding the water loses about 30 percent of potassium. Steaming and sauteing preserve potassium well. The kidney-diet strategy of "leaching" vegetables (soaking and boiling in lots of water, then discarding the water) is the same mechanism, used in reverse to lower potassium for people who must restrict it.

How to hit 3,400 mg in a day

A sample day for an adult male targeting 3,400 mg:

• Breakfast: 1 cup plain yogurt (573 mg), 1 cup berries (150 mg), 1 oz almonds (207 mg), 1 banana (422 mg). Subtotal: 1,352 mg.
• Lunch: Large salad with 1 cup chickpeas (477 mg), 1 cup raw spinach (167 mg), 1 oz sunflower seeds (186 mg), vinaigrette. Subtotal: 830 mg.
• Snack: 1 medium baked potato with skin (926 mg). Subtotal: 926 mg.
• Dinner: 4 oz salmon (484 mg), 1 cup steamed broccoli (457 mg), 1 cup cooked lentils (731 mg). Subtotal: 1,672 mg.

Total: about 4,780 mg, well above the 3,400 mg target. The point is not that you need this much but that hitting the target is easy when meals are built around vegetables, beans, fruit, and dairy. Use the Potassium Calculator to plan your own day, and the DASH Diet Score Calculator to check that the overall pattern aligns with the evidence.

Potassium supplements: why so many pills stop at 99 mg

Walk down a supplement aisle and most potassium pills contain 99 mg, a tiny fraction of the 3,400 mg daily target. The 99 mg convention traces to a 1991 FDA review of 26 case reports of small bowel lesions and strictures from slow-release potassium chloride tablets, which led to warning requirements on potassium chloride drug products above that dose. Contrary to a widespread belief, the NIH Office of Dietary Supplements notes that the FDA does not cap every potassium supplement at 99 mg - some products provide more. The practical conclusion still holds: you cannot reasonably supplement your way to adequate potassium; you have to eat it. Prescription potassium is available in larger doses for people on potassium-wasting diuretics, but it should never be taken without medical supervision because acute hyperkalemia can cause fatal cardiac arrhythmia.

The practical implication is that you cannot supplement your way to adequate potassium. You have to eat it. Salt substitutes made from potassium chloride (like Nu-Salt and NoSalt) provide about 600 mg of potassium per quarter teaspoon and are a useful swap for people trying to lower sodium while raising potassium, but they are contraindicated in kidney disease and for people on ACE inhibitors, ARBs, potassium-sparing diuretics, or aldosterone antagonists, all of which raise serum potassium.

Kidney disease: when high potassium is dangerous

For people with advanced chronic kidney disease (stage 4 or 5, or eGFR below 30), the kidneys cannot excrete potassium efficiently, and hyperkalemia becomes a real risk. In these patients, the potassium target is roughly 2,000 to 3,000 mg per day, lower than the Adequate Intake for healthy adults, and high-potassium foods like potatoes, tomatoes, bananas, and oranges are restricted. Leaching vegetables by soaking and boiling in excess water can reduce potassium by 50 percent or more.

People on the medications listed above (ACE inhibitors, ARBs, potassium-sparing diuretics, aldosterone antagonists) should also monitor potassium intake and serum levels, even with normal kidney function, because these drugs reduce potassium excretion. If you fall into either category, work with a registered dietitian and do not follow the high-potassium advice in this guide without individualization.

Salt substitutes and potassium chloride

Potassium chloride salt substitutes swap sodium for potassium and can be a useful tool for blood pressure. A 2021 trial by Neal and colleagues in the New England Journal of Medicine randomized 20,995 adults in rural China to a salt substitute (75 percent sodium chloride, 25 percent potassium chloride) or regular salt. The substitute group had a 12 percent lower rate of stroke and a 12 percent lower rate of major cardiovascular events over 5 years. The benefit came with a small increase in hyperkalemia, mainly in people with existing kidney disease.

For healthy adults and for people with normal kidney function who want to reduce sodium and increase potassium, a salt substitute is worth trying. Taste is slightly metallic compared with regular salt, but most people adapt. Do not use salt substitutes if you have kidney disease or take potassium-raising medications.

Potassium and bone health

The blood pressure story gets most of the attention, but potassium also matters for bone. A 2015 meta-analysis by Lambert and colleagues in Osteoporosis International pooled 14 trials and found that potassium supplementation, mostly as potassium citrate or bicarbonate, reduced urinary calcium excretion and modestly improved calcium balance. The proposed mechanism is that potassium alkali buffers the acid load of a typical Western diet, reducing the need to draw calcium from bone to neutralize acid.

The clinical implication is modest. Potassium from fruits and vegetables, which also deliver vitamin K, magnesium, and bicarbonate precursors, is more beneficial than potassium chloride supplements alone for bone. The DASH diet, which is high in both potassium and other bone-friendly nutrients, has been associated with lower risk of osteoporotic fracture in observational cohorts. The takeaway for most people is that the same potassium-rich foods that lower blood pressure also support bone, so the dietary advice does not change.

Cooking methods that preserve potassium

How you cook high-potassium foods changes how much potassium you actually eat. The general rule is that potassium is water-soluble, so any method that discards cooking water loses potassium:

• Baking, roasting, microwaving, and grilling preserve nearly all the potassium. A baked potato with skin keeps all 926 mg.
• Steaming and sauteing preserve most potassium, with losses of 5 to 15 percent.
• Boiling and discarding the water loses 20 to 50 percent of potassium, depending on the food and the cooking time. Boiled peeled potatoes lose about half their potassium.
• Soaking (leaching) in warm water for 2 to 4 hours, then boiling in fresh water and discarding the water, removes 50 to 75 percent of potassium. This is the technique used in renal diets to lower potassium for people who must restrict it.

For most people trying to increase potassium, the message is to bake, roast, microwave, or steam rather than boil, and to keep the skins on potatoes and other vegetables where much of the potassium concentrates. The skin of a baked potato alone delivers about 300 mg.

Signs you may be low on potassium

Mild potassium deficiency rarely produces symptoms until serum levels drop below 3.5 mmol per L. At that point, the classic signs are muscle cramps, weakness, fatigue, constipation, and in severe cases, palpitations and arrhythmia. The most common causes of low potassium are not low intake but excessive loss: diuretic use (especially loop diuretics like furosemide), prolonged vomiting or diarrhea, eating disorders, and heavy alcohol use. People on these medications or in these situations should have potassium monitored by a clinician rather than self-treating with food or supplements.

For the average person whose intake is low but whose kidneys are healthy, serum potassium will usually stay in the normal range because the kidneys conserve it. The cost of chronic low intake shows up not as a lab abnormality but as higher blood pressure, higher stroke risk, and higher kidney stone risk over years. This is why hitting the Adequate Intake matters even when your bloodwork looks fine.

The bottom line

Potassium is one of the most underconsumed nutrients in the American diet and one of the most impactful for blood pressure and stroke risk. The Adequate Intake is 3,400 mg per day for men and 2,600 mg for women, and fewer than 3 percent of adults hit it. The fix is food, not supplements, because most over-the-counter pills stop at 99 mg and prescription potassium is dangerous without supervision. Build meals around potatoes, beans, leafy greens, dairy, fish, and fruit, keep sodium low while you raise your potassium, and use the Potassium Calculator and Electrolyte Balance Calculator to track your intake. If you have kidney disease or take potassium-raising medications, this advice does not apply to you; work with a renal dietitian instead.