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A new study from Bar-Ilan University has found that staying well-hydrated may significantly reduce the risk of hypertension and heart failure, two of the most common chronic diseases worldwide. The research, published in the European Journal of Preventive Cardiology, analyzed health data from more than 400,000 adults over two decades, making it one of the largest and longest-running studies to examine the link between hydration and cardiovascular health.
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Higher sodium levels—even within the normal range—were linked to increased cardiovascular risk. Individuals with sodium levels of 140–142 mmol/L had a 13% higher risk of hypertension. Those with levels above 143 mmol/L had a 29% higher risk of hypertension and a 20% higher risk of heart failure.
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Nearly 60% of the healthy adult population studied had sodium levels in these risk-associated ranges.
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The study challenges the traditional view that sodium levels within the 135–146 mmol/L range are always safe, suggesting that even high-normal sodium may signal elevated heart risk.
Water makes up about 60% of the human body and is essential for critical functions such as nutrient transport, waste removal, and maintaining tissue and organ hydration. Dehydration can increase blood viscosity, strain the heart, and disrupt electrolyte balance, all of which may contribute to cardiovascular disease.
Lead author Prof. Jonathan Rabinowitz emphasized, “Hydration is a critical and often overlooked part of chronic disease prevention. A simple blood test might flag people who could benefit from basic lifestyle adjustments—like drinking more water, which reduces sodium levels”.
Health experts generally recommend drinking about eight 8-ounce glasses of water per day (the “8×8 rule”), though individual needs may vary. Monitoring urine color and not waiting until you feel thirsty are simple ways to ensure adequate hydration.
“Hydration is often overlooked in chronic disease prevention. This study adds compelling evidence that staying well-hydrated may help reduce the long-term risk of serious conditions like hypertension and heart failure,” said Prof. Rabinowitz.
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This article summarizes recent scientific findings and is intended for informational purposes only. It does not substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health or before making any changes to your hydration or lifestyle habits.
