Interesting fact - a healthy person's kidneys can excrete 25 litres of water a day. Drink more than this, and you expand your total body water volume to dangero

Interesting fact - a healthy person's kidneys can excrete 25 litres of water a day. Drink more than this, and you expand your total body water volume to dangerous levels, which can lead to swelling in soft tissues and lungs (which can be life threatening). This happens in patients with psychogenic polydipsia. Of course, drinking anywhere near 25L is not 'safe' either, and can still cause electrolyte abnormalities, neurocognitive dysfunction, seizures... Stick to the recommended intake, adjusted for water losses during significant exertion or high temperatures.