Drinking two litres of water per day is vital for keeping the body hydrated.
But rapidly getting through this amount — just shy of four pints — can be deadly, experts warn.
Centers for Disease Control and Prevention (CDC) bosses advise no more than 1.4 litres per hour, around six cups. Otherwise, it can trigger hyponatremia, a medical emergency that can shut down the body.
The CDC also warns it can happen with energy drinks and other fluids — though