For years, people have been told that one of the best ways to control high blood pressure is to eat less salt.
Doctors often advise patients to avoid salty snacks, processed foods, and fast food because too much sodium can raise blood pressure and increase the risk of heart disease and stroke.
However, new research suggests that there may be another important piece of the puzzle. Scientists from the University of Waterloo have found that eating more foods rich in potassium, such as bananas and broccoli, may be even more effective for lowering blood pressure than simply reducing salt intake.
The findings were published in the American Journal of Physiology-Renal Physiology and offer a fresh way of thinking about how diet affects heart health.
High blood pressure, also known as hypertension, is one of the most common health problems in the world. It affects more than 30 percent of adults globally and often develops without causing obvious symptoms. Because of this, doctors sometimes call it the “silent killer.”
Over time, untreated high blood pressure can damage blood vessels and increase the risk of serious conditions such as heart attacks, strokes, kidney disease, heart failure, and some forms of dementia.
For decades, public health advice has focused heavily on lowering sodium intake. This recommendation is supported by strong evidence showing that excess sodium can raise blood pressure.
When people eat too much salt, their bodies retain extra water. This increases the amount of fluid circulating in the bloodstream, putting more pressure on the walls of the arteries.
The new study suggests that potassium deserves just as much attention.
Potassium and sodium are both minerals called electrolytes. They help regulate many important functions in the body, including muscle contractions, nerve signals, and fluid balance. But when it comes to blood pressure, they work in opposite ways.
While too much sodium tends to raise blood pressure, potassium helps lower it. Potassium encourages the body to remove excess sodium through urine and helps blood vessels relax. Together, these effects can reduce pressure inside the arteries.
Professor Anita Layton, who led the research team and holds a Canada 150 Research Chair in Mathematical Biology and Medicine, explained that increasing potassium intake may provide greater benefits than simply cutting back on sodium.
The researchers also offered an interesting explanation for why modern populations struggle with high blood pressure. Early humans generally ate diets rich in fruits and vegetables and consumed much larger amounts of potassium and relatively little sodium. Over thousands of years, the human body likely adapted to function best with this balance.
Today, many people eat a very different diet. Processed foods, restaurant meals, packaged snacks, and fast foods often contain large amounts of sodium while providing relatively little potassium. At the same time, many people do not eat enough fruits and vegetables.
This shift may help explain why high blood pressure is so common in modern societies but appears much less frequently in some isolated populations that continue to eat more traditional diets.
To better understand how potassium and sodium affect blood pressure, the researchers developed a detailed computer model. This model allowed them to simulate different combinations of potassium and sodium intake and observe how these changes might influence blood pressure.
The computer model also revealed interesting differences between men and women. Men generally have a higher risk of developing high blood pressure than pre-menopausal women. However, the model suggested that men may also benefit more from increasing their potassium intake.
Computer models like this have become increasingly valuable in medical research. They allow scientists to explore many different scenarios quickly and at a relatively low cost. These tools can also guide future studies by helping researchers identify the most promising ideas to test in real people.
The findings do not mean people should ignore advice about reducing salt. Instead, the study suggests that improving the balance between potassium and sodium may be even more important than focusing on sodium alone.
Fortunately, many foods naturally contain large amounts of potassium. Bananas are perhaps the most famous example, but many other foods are also rich sources. Sweet potatoes, spinach, beans, avocados, tomatoes, oranges, and broccoli all provide substantial amounts of potassium and are already known to support overall health.
The research delivers a simple but powerful message. Managing blood pressure may not be only about avoiding salty foods. It may also involve actively choosing more potassium-rich foods.
In many cases, improving this balance could be as simple as reaching for a piece of fruit or adding extra vegetables to your meals. Small dietary changes like these may help protect the heart, lower blood pressure, and improve long-term health.
If you care about high blood pressure, please read studies that early time-restricted eating could help improve blood pressure, and natural coconut sugar could help reduce blood pressure and artery stiffness.
For more health information, please see recent studies about added sugar in your diet linked to higher blood pressure, and results showing vitamin D could improve blood pressure in people with diabetes.
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