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Potassium and heart disease: the critical connection · Good Recipes
Potassium and heart disease: the critical connection
Potassium and heart disease: the critical connection
Meet the mineral that does far more for your heart than any flashy supplement ever could.
Long read
August 28, 2025
The Potassium-Heart Connection: Unsung, and Underconsumed
When it comes to high blood pressure and heart disease, potassium doesn't get nearly the press that sodium does. We all know that salt is the primary villain, routinely blamed for sky-high blood pressure and soaring stroke rates. But what if the real problem isn't just too much sodium, but too little potassium?
Time-tested physiology and emerging research agree: potassium isn't just a valuable nutrient for supporting heart health, but a crucial linchpin of the whole cardiac operation. As you'll see, this humble mineral affects everything from your heartbeat to your blood pressure, and getting enough of it might be one of the very best ways there is to reduce your risk of stroke and heart disease. As with all things, it's possible to get too much of a good thing. But chances are very high you're not anywhere near that threshold.
In this article, you'll learn:
Why optimizing potassium is critical for all things cardiovascular
How potassium, sodium, and magnesium work in tandem
Exactly how much potassium you need- and how to get it from real food
Why getting it from food- and not supplements- is the way to go
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How Potassium Keeps the Heart in Rhythm
How could we underestimate a mineral that literally tells the heart when to beat? It's true- you've never had a single heartbeat without it, and never will. Potassium essentially governs the electrical impulses that regulate contraction and relaxation in the heart muscle. It moves in and out of cardiac cells through tiny gates called ion channels, helping reset the membrane's electrical balance after each contraction- not unlike a metronome that keeps your heart's rhythm steady. In this way, the rhythm section of the whole cardiovascular orchestra is kept right on pace. When potassium is out of balance, the song easily falls out of time.
Potassium, Sodium, and Magnesium: The Balancing Act
There's only so much we can speak of potassium without bringing sodium into the conversation (or vice versa), as the two work closely in tandem. Sodium pulls water into the blood vessels, increasing volume and pressure. Meanwhile, potassium helps to release that pressure by promoting vasodilation and encouraging excretion of excess sodium through the urine. Thus, these two primary electrolytes are in a constant and never-ending biochemical tug-of-war. And quite honestly, potassium usually loses, at least in the average Western diet.
The implications of sodium-potassium imbalance are severe and well-documented. In one , those with the highest potassium consumption had a 31 per cent lower risk of stroke or heart attack, while those with the highest sodium intake had a 60 per cent higher risk.
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How Much Potassium Do We Need - And Where Do We Get It?
A Word on Potassium Supplements
In short, forget them: potassium is a good example of a nutrient that is almost always best taken from food. The mineral content of over-the-counter potassium capsules is strictly regulated, and it would take a handful of pills to get even anywhere close to the RDA. Moreover, too much supplemental potassium can actually be dangerous, especially for those with kidney issues or on certain medications. Without a doubt, food is the safest and most effective way to restore balance.
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The Human Heart Runs on Potassium
Potassium isn't just some important mineral - it's critically essential in a way that is impossible to overstate. It stabilizes the heartbeat, balances blood pressure, and counters the sodium overload of modern diets high in processed food. It may also directly .
FAQ: Potassium and Heart Health
Is it bad to get too much potassium?
Yes, it can be - especially for people with kidney issues or those taking potassium-sparing medications. Excessive serum potassium levels can cause dangerous heart rhythms. This is another reason to stick to food-based sources, and to check with your doctor if ever in any doubt.
Can potassium actually lower blood pressure?
It absolutely can. Studies have shown that increased potassium can significantly drop systolic and diastolic blood pressure, especially in those with clinical hypertension. Meanwhile, low potassium intake is associated with high blood pressure.
Sources
Aburto, N. J., Hanson, S., Gutierrez, H., Hooper, L., Elliott, P., & Cappuccio, F. P. (2013). Effect of increased potassium intake on cardiovascular risk factors and disease: systematic review and meta-analyses. BMJ (Clinical research ed.), 346, f1378. https://doi.org/10.1136/bmj.f1378
British Heart Foundation. (2024, October 7). Can potassium-rich foods lower your blood pressure and keep your heart healthy?. British Heart Foundation. https://www.bhf.org.uk/informationsupport/heart-matters-magazine/news/behind-the-headlines/potassium-and-heart-health
Current dietary guidelines. Food Sources of Potassium | Dietary Guidelines for Americans. (n.d.). https://www.dietaryguidelines.gov/food-sources-potassium
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Damien ZielinskiA cloud-based functional medicine practitioner with a focus on mental health and insomnia
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Too little potassium, a condition called hypokalemia, is extremely common in hospital patients and strongly linked to dangerous arrhythmias like atrial and ventricular fibrillations, or even sudden fatal cardiac events. And while too much potassium (hyperkalemia) can also be dangerous, the "just right" zone between them is both somewhat narrow and crucially important to get right. One major meta-analysis involving over a million patients found that the sweet spot for serum potassium, where all-cause and cardiac mortality were lowest, was between 4 and 4.5 mmol/L.
Clearly, potassium isn't just some electrolyte in a sports drink, but an indispensable component of heart function at the most foundational level.
Magnesium also deserves an honourable mention: it's needed for transporting potassium into cells, including cardiac muscle. Without enough magnesium, potassium can't get where it needs to go, and this is why restoring potassium to optimum levels often fails until magnesium deficiency is corrected first. Replenishing both together in clinical settings is typically the best way to go.
Considering everything we've discussed about the importance of the most 'heartfelt' nutrient, it might not be surprising that the human body needs more potassium than any other mineral, and by far. We need much, much more than sodium, magnesium, iron, or even calcium.
Most adults need around 3,500–4,700mg of potassium per day, depending on age, weight, and whether they're managing conditions like high blood pressure or decreased kidney function. Unfortunately, a 2023 global review found that only 31 per cent of the world's population is averaging 2500mg daily potassium intake or higher, and only 14 per cent are getting above the recommended 3500mg.
Here are some great potassium-rich whole foods to prioritize:
Dried Apricots (1510 mg/cup)
Beet Greens (1309 mg/cup)
Prunes (1270 mg/cup)
Raisins (1080 mg/cup)
Avocado (975 mg/medium)
Swiss Chard (961 mg/cup)
Lima Beans (955 mg/cup)
Baked Potato with skin (926 mg/medium)
Yam (911 mg/cup)
Acorn Squash (896 mg/cup)
Spinach (839 mg/cup)
Lentils (731 mg/cup)
Edamame (676 mg/cup)
Clams (628mg / 100g)
Coconut Water (600 mg/cup)
Banana (451 mg/medium)
While most people, statistically, aren't getting close to enough of this precious element, the solution is simple and tasty: more real, colourful food. Incorporating more leafy greens, avocados, legumes, potatoes, and coconut water, which is something of a 'potassium hack'. If you are on meds that affect how your body handles it (especially ACE inhibitors or diuretics), increasing potassium in the diet is worth a conversation with your doctor. For the rest of us, adding a few more avocados to the week is almost definitely a great idea.
What foods are highest in potassium?
Top contenders include coconut water, dried apricots and other stone fruits, avocados, swiss chard, lima beans and other legumes, and potatoes with the skin.
D’Elia, L., Barba, G., Cappuccio, F. P., & Strazzullo, P. (2011). Potassium intake, stroke, and cardiovascular disease. Journal of the American College of Cardiology, 57(10), 1210–1219. https://doi.org/10.1016/j.jacc.2010.09.070
Fan, Y., Wu, M., Li, X., Zhao, J., Shi, J., Ding, L., Jiang, H., Li, Z., Zhang, W., Ma, T., Wang, D., & Ma, L. (2024, January 10). Potassium levels and the risk of all-cause and cardiovascular mortality among patients with cardiovascular diseases: A meta-analysis of Cohort Studies - Nutrition Journal. BioMed Central. https://nutritionj.biomedcentral.com/articles/10.1186/s12937-023-00888-z
Filippini, T., Violi, F., D'Amico, R., & Vinceti, M. (2017). The effect of potassium supplementation on blood pressure in hypertensive subjects: A systematic review and meta-analysis. International journal of cardiology, 230, 127–135. https://doi.org/10.1016/j.ijcard.2016.12.048
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How potassium can help prevent or treat high blood pressure. www.heart.org. (2025, August 28). https://www.heart.org/en/health-topics/high-blood-pressure/changes-you-can-make-to-manage-high-blood-pressure/how-potassium-can-help-control-high-blood-pressure
Komaroff, A. L. (2022, April 1). Does a low-salt diet really improve your health?. Harvard Health. https://www.health.harvard.edu/staying-healthy/does-a-low-salt-diet-really-improve-your-health
The link between potassium, magnesium, and heart health. (n.d.). https://ocrc.net/the-link-between-potassium-magnesium-and-heart-health/
Potassium can lower heart disease risk. HeartCert CPR Training. (2024, October 30). https://heartcertcpr.com/news/potassium-lower-heart-disease-risk/
Potassium lowers blood pressure. Harvard Health. (2017, January 23). https://www.health.harvard.edu/heart-health/potassium-lowers-blood-pressure
Reddin, C., Ferguson, J., Murphy, R., Clarke, A., Judge, C., Griffith, V., Alvarez, A., Smyth, A., Mente, A., Yusuf, S., & O’Donnell, M. J. (2023, March 8). Global mean potassium intake: A systematic review and Bayesian meta-analysis - European Journal of Nutrition. SpringerLink. https://link.springer.com/article/10.1007/s00394-023-03128-6
Routhenstein, M. (2024, April 24). Exploring the link between potassium and heart disease . Showit Blog. https://entirelynourished.com/exploring-the-link-between-potassium-and-heart-disease/
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Sica, D. A., Struthers, A. D., Cushman, W. C., Wood, M., Banas, J. S., Jr, & Epstein, M. (2002). Importance of potassium in cardiovascular disease. Journal of clinical hypertension (Greenwich, Conn.), 4(3), 198–206. https://doi.org/10.1111/j.1524-6175.2002.01728.x
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