Water Intoxication Is Real: A Medical Expert Explains the Risks

The term “water intoxication” might sound like a contradiction, but it’s a real and dangerous medical condition. A nephrology expert explains that drinking an extreme amount of water in a short period can be toxic to the body, overwhelming the kidneys and leading to a severe electrolyte imbalance with life-threatening consequences.
Our kidneys are designed to process about a liter of fluid per hour. When you consume much more than this, you exceed their excretory capacity. Their primary function of maintaining a stable internal environment is compromised. For a healthy adult, a total daily intake of two to three liters is generally safe and sufficient.
Forcing the body to handle an excessive fluid load puts immense strain on the kidneys. This high-volume intake dilutes the bloodstream, causing the concentration of vital electrolytes, especially sodium, to drop significantly. This disrupts the osmotic balance between the inside and outside of your body’s cells.
The resulting condition, hyponatremia, causes water to rush into cells to balance the sodium concentration, making them swell. This is particularly dangerous in the brain, where the skull leaves no room for expansion. The consequences can include severe headaches, confusion, seizures, and in the worst cases, coma or death.
While this condition is rare in the general population, it’s a known risk for endurance athletes or individuals who mistakenly believe that chugging water is a shortcut to health. The expert advice is clear: hydrate moderately. Drink when you feel thirsty, and be aware that more is not always better when it comes to water.