Public health advice on blood pressure has focused on one mineral for decades. A new peer-reviewed report in the American Journal of Clinical Nutrition argues that focusing on sodium alone leaves out half the equation, and that raising dietary potassium deserves equal emphasis.
Hypertension affects more than 1.28 billion adults worldwide and is a leading risk factor for cardiovascular disease. The World Health Organization recommends sodium intake below 2,000 milligrams per day, while global intake averages roughly double that. Potassium intake, meanwhile, falls far below optimal levels in both developed and developing nations, according to the authors.
Two things need to be stated alongside the finding. Potassium is not a supplement recommendation, and for people with kidney disease or on certain blood pressure medications, raising potassium can be dangerous. And the report was produced with support from a food industry committee, which readers should weigh.
The Physiology Behind the Pairing
Sodium and potassium work as a counterweighted system in the kidney, and blood pressure sits at the balance point.
Sodium retention increases fluid volume in the bloodstream, which raises pressure against arterial walls. Potassium counteracts this through several routes. It promotes sodium excretion in the urine, it helps relax blood vessel walls, and it influences the hormonal signaling in the renin-angiotensin-aldosterone system that governs how aggressively the kidney holds onto sodium.
That mechanism is why researchers increasingly treat the two together rather than separately. Modeling work published earlier this year suggested that raising potassium intake could have an effect on blood pressure comparable to, or greater than, reducing sodium alone, based on simulations of kidney, hormonal, and cardiovascular responses.
What the Report Argues
The authors, led by Naomi Fukagawa, professor of medicine emerita at the University of Vermont's Larner College of Medicine, make a practical argument as much as a physiological one. Sodium reduction alone has proven hard to sustain at the population level, constrained by the prevalent preference for salt taste and by the complexity of dietary habits and food processing.
Most sodium in wealthy countries does not come from a salt shaker. It comes from packaged and restaurant food, which puts the decision largely outside individual control.
Fukagawa's framing of the argument is that dietary interventions should be viewed holistically because food components interact and physiology is integrative across systems. Her conclusion is stated carefully: dietary sodium reduction remains a foundational strategy for hypertension prevention and management, but new evidence supports broadening an approach focused solely on sodium reduction to give equal emphasis to increasing potassium intake. The report reviews the basis for current intake recommendations, strategies for reducing sodium and raising potassium, implementation challenges, and research and policy priorities, as the university described it.
The evidence for the combined approach is not only mechanistic. A randomized trial of nearly 21,000 participants testing a salt substitute containing 75% sodium chloride and 25% potassium chloride reported a 14% reduction in stroke and a 13% reduction in major cardiovascular events.
The Funding Disclosure That Belongs Up Front
The report was supported by the Institute for the Advancement of Food and Nutrition Sciences and its Sodium in Food and Health Implications Committee, as stated in the announcement of the publication.
IAFNS is a science-focused nonprofit that convenes government, industry, and academia, and its funding comes substantially from food and beverage companies. That matters here for a specific reason: potassium chloride is the primary ingredient manufacturers use to replace sodium in processed foods, and the report explicitly examines potassium enhancement as a reformulation strategy.
A recommendation that shifts emphasis away from a singular focus on sodium reduction, toward an approach where an alternative ingredient carries part of the load, is one where the food industry has a commercial interest.
None of this makes the physiology wrong. The report was peer reviewed, potassium's role in blood pressure regulation is well established independently, and the salt substitute trial was conducted separately. But the framing of the emphasis shift is where funding should inform how much weight readers give the argument.
The Safety Limits That Change Who This Applies To
This is where general dietary advice stops and individual medical circumstances take over, and the distinction is not optional.
Potassium is cleared by the kidneys. When kidney function is impaired, potassium accumulates, and high blood potassium, called hyperkalemia, can cause dangerous heart rhythm disturbances. People with chronic kidney disease are frequently advised to limit potassium, the opposite of the general population recommendation. Public health experts have consistently cautioned that anyone with kidney disease should not significantly increase potassium intake without first consulting a clinician.
Several common blood pressure medications also raise potassium: ACE inhibitors, angiotensin receptor blockers, and potassium-sparing diuretics such as spironolactone. Adding potassium-rich salt substitutes on top of these can push levels into a dangerous range.
Anyone with kidney disease, diabetes with kidney involvement, heart failure, or taking any of those medications should not increase potassium intake or use a salt substitute without asking their clinician first. This applies to potassium chloride salt substitutes in particular, which deliver a concentrated dose.
For people without those conditions, the sources the report points to are foods rather than supplements: fruits, vegetables, legumes, and dairy. Potatoes, beans, lentils, leafy greens, bananas, and yogurt are among the higher-potassium options. Getting potassium from food also brings fiber and other nutrients, and the risk of overshooting from food alone is very low in people with normal kidney function. Coverage of the report notes that excessive sodium and insufficient potassium are both treated as modifiable contributors to elevated blood pressure.
Potassium supplements are a different matter and should not be taken without medical direction.
If you have high blood pressure, the most useful step is not a grocery change but a conversation. Ask your clinician whether your kidney function and current medications make increased potassium appropriate for you, and ask whether a salt substitute is safe given what you take. Blood tests can answer both questions.
Home blood pressure monitoring, taken correctly and recorded over time, remains the most useful data you can bring to that appointment.
Frequently Asked Questions
What does the report argue? That sodium reduction should remain foundational for blood pressure control but that raising dietary potassium deserves equal emphasis in public health recommendations.
How does potassium lower blood pressure? It promotes sodium excretion by the kidney, helps relax blood vessel walls, and influences hormonal signaling that governs sodium retention.
How much sodium is recommended? The World Health Organization recommends below 2,000 milligrams per day. Global average intake is roughly double that.
Who should not increase potassium? People with chronic kidney disease, heart failure, or diabetes with kidney involvement, and anyone taking ACE inhibitors, ARBs, or potassium-sparing diuretics, without clinician approval.
Are salt substitutes safe? For many people, yes, and a large trial found stroke and cardiovascular event reductions. For people with impaired kidney function or on certain medications, they can cause dangerous hyperkalemia.
Who funded the report? It was supported by the Institute for the Advancement of Food and Nutrition Sciences and its sodium committee, a nonprofit substantially funded by food and beverage companies.
Where should potassium come from? Food rather than supplements for most people. Fruits, vegetables, legumes, and dairy are the main sources. Supplements require medical direction.
