Explainer · Nutrition & Diet
Potassium and blood pressure: why experts now want more of it, not just less salt
Cutting salt has been the main dietary advice for high blood pressure for decades, and most people have not managed it. A review in a leading nutrition journal argues potassium deserves equal billing.
- A narrative review in the American Journal of Clinical Nutrition on sodium, potassium and blood pressure.
- Salt reduction remains the main dietary advice, but most people find it hard to eat less salt.
- The authors argue evidence that low potassium drives high blood pressure has strengthened.
- They propose public health advice should add eating more potassium as a partner to cutting salt.
- This is an expert argument built on existing research, not a new trial.
Eat less salt has been the headline dietary advice for high blood pressure for a generation. It is sound advice, and most people do not follow it: salt is everywhere in processed food, and people like the taste. Potassium, the other half of the equation, has had much less attention.
A review in the American Journal of Clinical Nutrition argues that should change. The authors propose adding a clear message to eat more potassium, alongside eating less salt, as a central part of public health advice on blood pressure.
What potassium does
MedlinePlus explains that potassium is a mineral that your body needs to work properly: it helps nerves function and muscles contract. It also notes that a diet rich in potassium helps to offset some of sodium’s harmful effects on blood pressure, which is why the two minerals are best thought of together.
The kidneys handle both. Potassium helps them get rid of sodium and helps blood vessel walls relax, so a diet low in potassium and high in salt pushes blood pressure up from two directions at once.
What the sodium and potassium review looked at
This is a narrative review, meaning experts pulling together existing evidence and arguing a position, rather than a new study or a formal pooling of trials. It reviews the basis for current intake recommendations for sodium and potassium, the strategies for cutting one and raising the other, and what gets in the way.
The starting point is a frank admission about salt. The authors write that successful reduction in sodium intake remains a significant challenge because of the prevalent preference for salt taste, along with food production, dietary habits and cultural differences.
What the evidence now says about potassium
The review’s central claim is that potassium’s evidence has caught up. The authors acknowledge that the evidence for potassium’s effect on BP has not been as strong as that for sodium, but this is changing, and describe new understanding of the critical role inadequate potassium intake plays in causing high blood pressure.
From that they draw a policy conclusion: the nutrient-based public health strategy should now include increased potassium intake as a partner with sodium reduction. Their argument is that pairing the two will do more than pushing harder on salt alone.
Why the potassium message matters
Most people eat far more salt and far less potassium than recommended, and the two tend to travel together: diets built on processed food are high in one and low in the other. Shifting toward whole foods moves both in the right direction at once.
There is also a practical appeal. Being told to eat more of something is often easier to act on than being told to give something up, and the foods richest in potassium, such as beans, potatoes, leafy greens, fruit and yogurt, are cheap and widely available.
What an expert review cannot settle
A narrative review reflects the judgment of its authors about which studies matter most, and others may weigh the evidence differently. It does not present new data, and it does not establish how much extra potassium would change blood pressure for any individual.
More potassium is not safe for everyone. People with kidney disease, and people taking some common blood pressure medicines, can build up dangerous levels, so the message applies to food for most people and to supplements only under medical supervision.
What this changes for people with high blood pressure
For most people, the practical advice is a combination: cut back on salty processed food, and eat more fruit, vegetables, beans and dairy or fortified alternatives. Salt substitutes that swap some sodium for potassium are another option for many, with the same caution for kidney problems.
If you have kidney disease or take a blood pressure medicine, check with your doctor before adding potassium supplements or substitutes. For everyone else, this is one of the rare pieces of nutrition advice that asks for more rather than less.
People also ask
What does the review argue?
That new understanding of the critical role inadequate potassium intake plays in the development of hypertension means the nutrient-based public health strategy should include increased potassium intake as a partner with sodium reduction, rather than focusing on sodium alone.
How does potassium affect blood pressure?
Potassium helps the kidneys get rid of sodium and helps blood vessel walls relax. MedlinePlus notes that a diet rich in potassium helps offset some of sodium's harmful effects on blood pressure.
Which foods are high in potassium?
Beans and lentils, potatoes and sweet potatoes, leafy greens, tomatoes, bananas, oranges, dried fruit, yogurt, fish and nuts. Most whole, minimally processed plant foods are good sources.
Should I take potassium supplements?
Not without medical advice. Too much potassium can be dangerous, especially for people with kidney disease or those taking certain blood pressure drugs such as ACE inhibitors, ARBs or potassium-sparing diuretics.
What about salt substitutes?
Many replace some sodium chloride with potassium chloride. They can lower blood pressure for many people but carry the same caution for anyone with kidney problems or on medicines that raise potassium.
What does this change for me?
Keep cutting back on salty processed food, and add more potassium-rich whole foods. If you have kidney disease or take blood pressure medicines, ask your doctor before changing potassium intake. This is general information rather than medical advice.