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Home Science & Environment Medical Research

Mathematical model demonstrates ratio of potassium to sodium intake key to regulating blood pressure

April 14, 2025
in Medical Research
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High blood pressure? Eat more bananas
Graphical abstract. Credit: American Journal of Physiology-Renal Physiology (2024). DOI: 10.1152/ajprenal.00222.2024

New research from the University of Waterloo suggests increasing the ratio of dietary potassium to sodium intake may be more effective for lowering blood pressure than simply reducing sodium intake.

The study, “Modulation of blood pressure by dietary potassium and sodium: sex differences and modeling analysis”, was published in the American Journal of Physiology-Renal Physiology.

High blood pressure affects over 30% of adults globally. It’s the leading cause of coronary heart disease and stroke and may also lead to other afflictions like chronic kidney disease, heart failure, irregular heartbeats, and dementia.

“Usually, when we have high blood pressure, we are advised to eat less salt,” said Anita Layton, professor of Applied Mathematics, Computer Science, Pharmacy and Biology at the University of Waterloo and the Canada 150 Research Chair in Mathematical Biology and Medicine.

“Our research suggests that adding more potassium-rich foods to your diet, such as bananas or broccoli, might have a greater positive impact on your blood pressure than just cutting sodium.”

Potassium and sodium are both electrolytes—substances that help the body send electrical signals to contract muscles, affect the amount of water in your body and perform other essential functions.

“Early humans ate lots of fruits and vegetables, and as a result, our body’s regulatory systems may have evolved to work best with a high-potassium, low-sodium diet,” said Melissa Stadt, a Ph.D. candidate in Waterloo’s Department of Applied Mathematics and the lead author of the study.

“Today, western diets tend to be much higher in sodium and lower in potassium. That may explain why high blood pressure is found mainly in industrialized societies, not in isolated societies.”

While previous research found that increasing potassium intake can help control blood pressure, the researchers developed a mathematical model that successfully identifies how the ratio of potassium to sodium impacts the body.

The model also identifies how sex differences affect the relationship between potassium and blood pressure. The study found that men develop high blood pressure more easily than premenopausal women, but men are also more likely to respond positively to an increased ratio of potassium to sodium.

The researchers emphasize that mathematical models like the one used in this study allow these kinds of experiments to identify how different factors impact the body quickly, cheaply, and ethically.

More information:
Melissa Stadt et al, Modulation of blood pressure by dietary potassium and sodium: sex differences and modeling analysis, American Journal of Physiology-Renal Physiology (2024). DOI: 10.1152/ajprenal.00222.2024

Provided by
University of Waterloo


Citation:
Mathematical model demonstrates ratio of potassium to sodium intake key to regulating blood pressure (2025, April 14)
retrieved 14 April 2025
from https://medicalxpress.com/news/2025-04-mathematical-ratio-potassium-sodium-intake.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.



High blood pressure? Eat more bananas
Graphical abstract. Credit: American Journal of Physiology-Renal Physiology (2024). DOI: 10.1152/ajprenal.00222.2024

New research from the University of Waterloo suggests increasing the ratio of dietary potassium to sodium intake may be more effective for lowering blood pressure than simply reducing sodium intake.

The study, “Modulation of blood pressure by dietary potassium and sodium: sex differences and modeling analysis”, was published in the American Journal of Physiology-Renal Physiology.

High blood pressure affects over 30% of adults globally. It’s the leading cause of coronary heart disease and stroke and may also lead to other afflictions like chronic kidney disease, heart failure, irregular heartbeats, and dementia.

“Usually, when we have high blood pressure, we are advised to eat less salt,” said Anita Layton, professor of Applied Mathematics, Computer Science, Pharmacy and Biology at the University of Waterloo and the Canada 150 Research Chair in Mathematical Biology and Medicine.

“Our research suggests that adding more potassium-rich foods to your diet, such as bananas or broccoli, might have a greater positive impact on your blood pressure than just cutting sodium.”

Potassium and sodium are both electrolytes—substances that help the body send electrical signals to contract muscles, affect the amount of water in your body and perform other essential functions.

“Early humans ate lots of fruits and vegetables, and as a result, our body’s regulatory systems may have evolved to work best with a high-potassium, low-sodium diet,” said Melissa Stadt, a Ph.D. candidate in Waterloo’s Department of Applied Mathematics and the lead author of the study.

“Today, western diets tend to be much higher in sodium and lower in potassium. That may explain why high blood pressure is found mainly in industrialized societies, not in isolated societies.”

While previous research found that increasing potassium intake can help control blood pressure, the researchers developed a mathematical model that successfully identifies how the ratio of potassium to sodium impacts the body.

The model also identifies how sex differences affect the relationship between potassium and blood pressure. The study found that men develop high blood pressure more easily than premenopausal women, but men are also more likely to respond positively to an increased ratio of potassium to sodium.

The researchers emphasize that mathematical models like the one used in this study allow these kinds of experiments to identify how different factors impact the body quickly, cheaply, and ethically.

More information:
Melissa Stadt et al, Modulation of blood pressure by dietary potassium and sodium: sex differences and modeling analysis, American Journal of Physiology-Renal Physiology (2024). DOI: 10.1152/ajprenal.00222.2024

Provided by
University of Waterloo


Citation:
Mathematical model demonstrates ratio of potassium to sodium intake key to regulating blood pressure (2025, April 14)
retrieved 14 April 2025
from https://medicalxpress.com/news/2025-04-mathematical-ratio-potassium-sodium-intake.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.


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