10 Potassium-Rich Food Sources: A Comprehensive Guide

Potassium is an essential electrolyte and mineral crucial for human health [1]. It plays a fundamental role in maintaining normal cell function, regulating blood pressure by balancing the effects of sodium, supporting proper nerve signal transmission, and facilitating muscle contraction, including heart rhythm [2]. A diet rich in potassium-containing foods has been associated with a lower risk of stroke and hypertension, or high blood pressure [3].

This guide explores ten powerful sources of potassium and how they can be easily integrated into a balanced diet.

10 Essential Potassium Sources

1. Bananas

Bananas are perhaps the most popular and convenient source of potassium. A medium-sized banana contains approximately 358 mg of potassium per 100g [4]. They also provide vitamin B6 and dietary fiber, supporting digestive health. Their natural sweetness and portability make them a convenient and healthy snack, ideal for pre- or post-workout fuel, smoothies, or a topping for cereal and oatmeal.

2. Avocados

Avocados are renowned for their heart-healthy monounsaturated fats and are an excellent source of potassium. A typical serving of avocado contains approximately 485 mg of potassium per 100g [4]. They are also rich in fiber, vitamin K, and folate. Enjoy them mashed on toast, sliced into salads, or blended into creamy dips like guacamole.

3. Sweet Potatoes

Sweet potatoes are a nutrient-dense root vegetable providing a significant amount of potassium, around 337 mg per 100g [4]. They are also an excellent source of beta-carotene (which the body converts to Vitamin A), vitamin C, and fiber. They can be baked, mashed, or roasted and make a versatile, nutritious side or main dish.

4. Spinach

Spinach is a powerhouse vegetable. One cup (approximately 180g) of cooked spinach packs approximately 558 mg of potassium per 100g [4]. It’s perfect in salads, smoothies, or stir-fries, boosting both potassium and other micronutrients like iron, folate, and vitamins A and K.

5. Beans (White Beans)

Beans, particularly cooked white beans, are a fantastic source of potassium, containing around 561 mg per 100g [4]. They are also exceptionally high in plant-based protein, dietary fiber, folate, and iron. They can be added to salads, stews, or soups for a wholesome, filling meal. Note: The potassium content varies by bean type; white beans, lima beans, and kidney beans typically have higher levels.

6. Coconut Water

Coconut water is a popular, natural source of electrolytes. One cup (240g) of plain coconut water contains around 250 mg of potassium per 100g [4]. It’s a low-calorie, naturally-sweetened alternative to sugary sports drinks and is often consumed as a refreshing beverage to aid hydration.

7. Potatoes

A medium baked potato with the skin is one of the most concentrated sources of potassium, containing approximately 421 mg per 100g [4]. Potatoes also provide vitamin C, B6, and fiber when eaten with the skin. Opt for healthier cooking methods like baking or roasting instead of frying.

8. Legumes (Lentils)

Legumes, such as cooked lentils, are a staple in many global diets and are high in potassium, offering approximately 369 mg per 100g [4]. They provide essential fiber and plant-based protein. They can be used in curries, stews, salads, or vegetarian patties.

9. Salmon

Fatty fish like salmon are an excellent source of potassium, with wild Atlantic salmon offering about 363 mg per 100g [4]. These fish also provide heart-healthy omega-3 fatty acids, making them a highly nutritious addition to your diet. Canned tuna has a slightly lower amount, around 237 mg per 100g [4].

10. Tomatoes (Paste)

While fresh tomatoes provide about 237 mg of potassium per 100g [4], concentrated tomato products are a much richer source. For example, tomato paste contains a significant 1014 mg of potassium per 100g [4], and even tomato sauce is a good source. Using tomato paste in sauces or soups is an easy way to boost potassium intake.

Other Notable Sources of Potassium

Dairy and Dried Fruits

Other nutrient-dense foods that contribute to daily potassium intake include:

• Dairy Products: Milk and yogurt contain moderate amounts of potassium.
• Dried Apricots: Highly concentrated, offering 1162 mg per 100g [4], but should be eaten in moderation due to their high sugar content.
• Nuts and Seeds: Pistachios and almonds, in particular, provide a good boost. For example, almonds offer 733 mg per 100g [4].

Conclusion

Potassium is a powerhouse mineral essential for vital bodily functions, from cardiovascular health to nerve and muscle activity [2]. The Recommended Dietary Allowance (RDA) for potassium is 3,400 mg for adult men and 2,600 mg for adult women [5]. By including a wide variety of potassium-rich foods like fruits, vegetables, legumes, fish, and moderate amounts of dairy, most people can meet their daily requirements and support overall health.

However, a crucial balance must be maintained. While low potassium (hypokalemia) can be harmful, excessively high levels (hyperkalemia) can be dangerous and potentially life-threatening, particularly affecting heart rhythm [6].

It is imperative to consult a healthcare professional, especially if you have chronic kidney disease (CKD), are undergoing dialysis, or are taking medications (such as ACE inhibitors or potassium-sparing diuretics) that affect potassium excretion [6]. These conditions require careful, personalized dietary guidance to prevent hyperkalemia.

Frequently Asked Questions (FAQs)

What are the common signs of low potassium (hypokalemia)?

Common signs of low potassium include muscle weakness, fatigue, constipation, abdominal bloating, heart palpitations, and in severe cases, muscle cramps, spasms, or abnormal heart rhythms [7].

How much potassium do you need daily?

The recommended daily potassium intake (RDA) is 3,400 mg for adult men and 2,600 mg for adult women. For pregnant women, the recommendation is 2,900 mg, and for breastfeeding women, it is 2,800 mg [5].

Which single food has the highest potassium content?

Among commonly consumed foods, tomato paste, dried apricots, white beans, and potatoes (with skin) are among the richest sources per 100g [4].

Is eating one banana a day enough to meet my potassium requirements?

No. While a medium banana is an excellent source, providing about 358 mg of potassium per 100g [4], consuming just one banana daily is not enough to meet the total recommended daily intake, which ranges from 2,600 to 3,400 mg [5]. Meeting your full potassium requirement requires eating a wide variety of potassium-rich foods throughout the day.

References

[1] McLean, R. M. (2021). Chapter Three – Potassium. In Advances in Nutrition Research (Vol. 13, pp. 69–84). Elsevier. https://www.sciencedirect.com/science/article/pii/S1043452621000188

[2] Malavolti, M., Naska, A., Fairweather-Tait, S. J., Malagoli, C., Vescovi, L., Marchesi, C., Vinceti, M., & Filippini, T. (2021). Sodium and potassium content of foods consumed in an Italian population and the impact of adherence to a Mediterranean diet on their intake. Nutrients, 13(8), 2681. https://doi.org/10.3390/nu13082681

[3] Appel, L. J., Moore, T. J., Obarzanek, E., Vollmer, W. M., Svetkey, L. P., Sacks, F. M., Bray, G. A., Vogt, S. M., Harsha, J. W., Phillips, K. M., Kastenberg, S. A., & Conlin, C. R. (1997). A clinical trial of the effects of dietary patterns on blood pressure. The New England Journal of Medicine, 336(16), 1117–1124. https://www.nejm.org/doi/full/10.1056/NEJM199704173361601

[4] U.S. Department of Agriculture (USDA), Agricultural Research Service, FoodData Central. (n.d.). FDC ID: 171705 (Avocados, raw, all commercial varieties). Retrieved October 28, 2025, from https://fdc.nal.usda.gov/fdc-app.html#/food-details/171705/nutrients

[5] National Institutes of Health (NIH), Office of Dietary Supplements. (2024). Potassium Fact Sheet for Health Professionals. Retrieved October 28, 2025, from https://ods.od.nih.gov/factsheets/Potassium-HealthProfessional/

[6] Kovesdy, C. P. (2015). Management of hyperkalemia in patients with kidney disease. Kidney International, 88(3), 562–572. https://doi.org/10.1038/ki.2015.152

[7] Gennari, F. J. (1998). Hypokalemia. The New England Journal of Medicine, 339(1), 45–52. https://www.nejm.org/doi/full/10.1056/NEJM199807023390108