Many people believe that drinking excessive amounts of water is always beneficial, but that’s not necessarily true. Dr Pradnya Harshe, consultant nephrologist and transplant physician at Bhailal Amin General Hospital, Vadodara, explains how much water is appropriate for maintaining kidney health and overall well-being.
The kidneys are essential in regulating the body’s fluid and electrolyte balance. Drinking an adequate amount of water helps flush out toxins and maintain healthy blood pressure. For most healthy adults, around 2 to 3 liters per day, including fluids obtained from food and beverages, is sufficient. Drinking significantly more than this does not provide extra protection against kidney disease and can even be harmful.
Excess water intake can strain the kidneys, forcing them to work harder to excrete the surplus fluid. This can upset electrolyte balance, particularly sodium levels in the blood, leading to a condition called hyponatremia. Symptoms of hyponatremia may include nausea, confusion, seizures, and in severe cases, hospitalisation and water restriction may be required.
Higher water intake is mainly necessary under specific conditions. High-performance athletes may need more fluids due to heavy sweating, but should also consume electrolytes under professional guidance. Similarly, people working outdoors in high temperatures can lose significant water and electrolytes through sweat and may require additional hydration to stay balanced.
For the average individual with a normal daily routine, drinking 5 to 6 liters of water per day is unnecessary and potentially harmful. Instead of focusing on large quantities, it is recommended to drink when thirsty and monitor urine color, aiming for light yellow as a sign of proper hydration. Drinking excessively does not prevent kidney disease but can stress the kidneys and disrupt the body’s electrolyte balance.
Note: This article is for informational purposes only and is not a substitute for professional medical advice. Always consult a doctor with any medical concerns.