Blood pressure guidance may be missing an important mineral

Advice for lowering high blood pressure often begins with cutting back on salt. A new scientific report says that approach should also place more emphasis on potassium, since the two minerals interact in ways that can influence blood pressure.

The report does not describe a new clinical trial. Instead, its authors reviewed existing studies on sodium and potassium and examined how diets might reduce one while increasing the other.

Sodium is a key component of table salt and is found in many processed foods. When the body retains too much sodium, it can hold extra water, raising pressure in the blood vessels.

Potassium supports the kidneys in removing sodium through urine and helps blood vessels work normally. Looking at both minerals together may therefore target different parts of the same issue, particularly in populations that consume too much sodium and too little potassium.

Published in The American Journal of Clinical Nutrition, the report highlights potassium-rich foods such as beans, potatoes, leafy greens, fruit, and yogurt. Swapping some of these foods for salty products can shift both sides of the diet at once.

Another approach is to replace part of the sodium chloride in salt with potassium chloride. This can lower sodium in a product while raising potassium, though taste limits how much a manufacturer can use.

Kidney health also plays a role in blood pressure management; see how high blood pressure can affect both the kidneys and heart.

Food changes in stores may have the greatest impact for people who get much of their sodium from packaged meals or snacks. In places where salt is added more often during cooking, the products available for home use may matter more.

Potassium-fortified salt and supplements bring separate safety concerns. People with kidney disease or other conditions that reduce potassium excretion may be vulnerable to excess potassium, as may those taking certain medications that increase potassium levels.

The World Health Organization’s guidance on potassium-containing salt substitutes excludes people with kidney impairment or other conditions that affect potassium removal. That distinction is important when turning average blood pressure findings into policies that apply to large populations.

The report was supported by a committee of the Institute for the Advancement of Food and Nutrition Sciences. Its recommendations raise questions for researchers and public health agencies, including which products people will accept, how much diets truly change, and whether sodium and potassium can be improved together without adding risk for people who need to restrict potassium.

If you are interested in this topic, please read articles about Why bananas can lower blood pressure effectively, and Salt and heart health: does less really mean more?.

For more information, please see articles about The DASH diet is a simple way to lower high blood pressure, and Eating smart for kidney health: High-potassium foods to avoid.

Source: University of Vermont.