You Must Drink 8 Glasses of Water Daily — Oversimplified Myth

The idea that everyone must drink exactly 8 glasses of water daily is not scientifically grounded. Hydration needs vary depending on body size, climate, activity level, and diet.
Fluids from food (like fruits and vegetables) and other beverages also contribute to daily hydration. The body has a built-in mechanism—thirst—that usually regulates fluid intake effectively.
Forcing excessive water intake without need can even be harmful in rare cases, leading to water intoxication.