People living with high blood pressure are often encouraged to limit their daily salt intake to under 6g. But new findings suggest that merely cutting back on sodium may not be enough. Experts now recommend increasing dietary potassium—commonly found in bananas and broccoli—as a more impactful way to manage blood pressure levels.Researchers at the University of Waterloo in Canada have developed a mathematical model that emphasizes the importance of the balance between potassium and sodium in the diet. Their findings indicate that raising the ratio of potassium to sodium may be more effective for blood pressure control than focusing solely on reducing salt. “Usually, when we have high blood pressure, we are advised to eat less salt,” explained Dr Anita Layton, a professor of applied mathematics, computer science, pharmacy, and biology at the university. “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.”Excess salt in the diet can lead the body to retain water, which adds pressure to blood vessel walls and may eventually cause damage to organs such as the kidneys. While reducing salt is beneficial, potassium offers a counteracting effect by helping the body expel sodium through urine and relax blood vessel walls.Both potassium and sodium are electrolytes—substances essential for regulating bodily functions such as nerve signaling, muscle contractions, and fluid balance. The model created by the Waterloo team shows how increasing potassium can restore a more favorable electrolyte balance, supporting healthy blood pressure regulation.Study leader Melissa Stadt, a PhD candidate in Waterloo's Department of Applied Mathematics, highlighted that human diets have drastically changed over time. “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,” she said. "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 industrialised societies, not in isolated ones."16 Million People In UK Have High Blood PressureCurrently, around one-third of adults in the UK—an estimated 16 million people—are thought to have high blood pressure. Alarmingly, more than five million of them remain undiagnosed, putting them at greater risk for heart attacks, strokes, and kidney disease.These new findings suggest that a shift in dietary focus could make a meaningful difference. Rather than concentrating solely on what to avoid, such as salt, patients may benefit even more by including potassium-rich foods like spinach, sweet potatoes, lentils, and avocados as part of their daily meals.As research continues to uncover the intricate connections between diet and health, one thing is clear: the solution to high blood pressure may lie not just in subtraction but in smarter additions to our plates.