The single best thing you can eat to increase potassium is a baked potato with the skin on, which delivers 919 mg in one medium potato. That’s roughly a third of the daily target for adult women (2,600 mg) and over a quarter of the target for adult men (3,400 mg). But potassium is spread across many food groups, so building your intake is less about finding one magic food and more about knowing which everyday choices pack the most per serving.
The Highest-Potassium Foods by Category
Potassium shows up in vegetables, fruits, beans, dairy, and meat. Here’s how common foods rank by milligrams per standard serving:
- Baked potato with skin: 919 mg (1 medium)
- Cooked spinach: 591 mg (½ cup)
- Cantaloupe: 417 mg (1 cup)
- Low-fat milk: 388 mg (1 cup)
- Pinto beans: 373 mg (½ cup cooked)
- Low-fat fruit yogurt: 366 mg (6 oz container)
- Banana: 362 mg (1 small)
- Baked chicken breast: 359 mg (1 medium)
- Edamame: 338 mg (½ cup boiled)
- Baby carrots: 320 mg (10 carrots)
- Corn: 282 mg (1 ear)
- Raisins: 270 mg (¼ cup)
- Broccoli: 268 mg (½ cup cooked)
- Orange: 237 mg (1 medium)
- Strawberries: 230 mg (1 cup)
Bananas get all the credit as a potassium food, but a baked potato has more than two and a half times as much. Cooked spinach beats bananas by over 200 mg per serving. If you’re trying to close a gap in your intake, starchy vegetables and cooked greens are more efficient than fruit.
How Much Potassium You Actually Need
The adequate intake set by the National Academies of Sciences, Engineering, and Medicine is 3,400 mg per day for adult men and 2,600 mg for adult women. Pregnant women need about 2,900 mg, and those who are breastfeeding need around 2,800 mg. Children’s targets range from 2,000 mg at ages 1 to 3 up to 3,000 mg for teenage boys.
Most people fall short. The typical Western diet is heavy on processed foods, which tend to be high in sodium and low in potassium. Hitting your daily target usually means eating several servings of vegetables, a piece of fruit, and some beans or dairy throughout the day. A meal built around a baked potato, a side of cooked spinach, and a glass of milk would deliver close to 1,900 mg on its own.
Why Potassium Matters for Blood Pressure
Potassium and sodium work as counterweights in your body. A diet high in sodium and low in potassium causes the smooth muscle cells lining your blood vessels to contract, which narrows those vessels and raises blood pressure. Potassium helps your kidneys flush excess sodium into your urine. As sodium levels drop, blood vessels relax, peripheral resistance decreases, and blood pressure comes down.
This is the core principle behind the DASH diet, which emphasizes fruits, vegetables, beans, and low-fat dairy. The blood pressure benefits come not just from eating less salt but from shifting the overall ratio of sodium to potassium in your diet. For most people, increasing potassium through food is one of the more effective dietary changes for cardiovascular health.
How Cooking Affects Potassium Content
Potassium is water-soluble, so cooking method matters. Boiling vegetables in water can leach potassium into the cooking liquid. If you drain that water, you lose some of the mineral along with it. Steaming tends to preserve potassium better, with studies on broccoli and carrots showing similar retention between boiling and traditional steaming, but notably less loss than oven-based methods. Roasting or baking at high heat caused potassium losses of 20% to 40% in vegetables like zucchini and broccoli in one study.
The practical takeaway: if you boil potatoes or vegetables, using the cooking liquid in a soup or sauce recaptures some of that lost potassium. Steaming and microwaving are solid choices for keeping potassium intact. Eating potassium-rich foods raw, like baby carrots, cantaloupe, or strawberries, sidesteps the issue entirely.
Signs You May Be Low on Potassium
Mild potassium deficiency often produces no obvious symptoms. Noticeable signs typically don’t appear until blood levels drop below 3.0 mmol/L (the normal lower limit is 3.5 mmol/L). When symptoms do show up, they include muscle weakness, cramps, fatigue, heart palpitations, constipation, and abdominal discomfort. The weakness tends to start in the legs before affecting the upper body.
Severe deficiency, with blood levels below 2.5 mmol/L, can cause dangerous heart rhythm problems and even respiratory muscle failure. This level of depletion is rare from diet alone and usually involves other factors like prolonged vomiting, diarrhea, or certain medications. Still, chronically low dietary intake can keep your levels at the low end of normal, which may contribute to higher blood pressure and muscle issues over time.
Why Food Beats Supplements
Over-the-counter potassium supplements are intentionally limited in dose. Most contain only 99 mg per pill, a fraction of the 2,600 to 3,400 mg daily target. This restriction exists because concentrated potassium taken all at once can cause dangerous spikes in blood levels, particularly in people with reduced kidney function. A single baked potato delivers more than nine times what’s in a typical supplement capsule, and the potassium from food is absorbed gradually alongside other nutrients.
Food sources also come packaged with fiber, magnesium, and other compounds that work together for cardiovascular benefit. Supplements have a role in clinical settings when a doctor identifies a specific deficiency, but for routine intake, food is safer and more effective.
Who Should Be Cautious About Adding Potassium
People with chronic kidney disease need to be careful. Healthy kidneys efficiently filter excess potassium from the blood, but as kidney function declines, potassium can accumulate to dangerous levels. In the early stages of kidney disease, dietary restrictions are typically minimal. As the disease progresses, your care team may ask you to limit serving sizes of high-potassium foods and avoid products listing potassium chloride as an ingredient.
Certain medications also affect how your body handles potassium. ACE inhibitors, a common class of blood pressure drugs, block a hormone pathway that normally helps your kidneys excrete potassium. This can raise blood potassium levels by 2% to 6% even under normal circumstances. The risk increases when ACE inhibitors are combined with potassium-sparing diuretics, certain anti-inflammatory drugs, or other medications that promote potassium retention. If you take blood pressure medication and want to significantly increase your potassium intake through diet, it’s worth having your levels checked first.
Building a High-Potassium Day
Reaching 3,000+ mg of potassium per day doesn’t require exotic foods or complicated planning. A realistic day might look like this: a cup of low-fat yogurt and a small banana at breakfast (728 mg), a chicken breast with a side of cooked broccoli at lunch (627 mg), a handful of raisins as a snack (270 mg), and a baked potato with cooked spinach at dinner (1,510 mg). That’s over 3,100 mg without trying especially hard.
The pattern that works is simple: include a vegetable or fruit at every meal, favor whole foods over processed ones, and let potatoes, beans, and leafy greens do the heavy lifting. Swapping a bag of chips for ten baby carrots saves sodium and adds 320 mg of potassium, moving the ratio in the right direction on both sides.