"Drink more water" advice has a limit — exercise-associated hyponatraemia, caused by drinking more fluid than you lose during prolonged exercise, has caused documented fatalities in endurance events. Here's why thirst-based drinking is now generally preferred over fixed schedules, who's at higher risk, and what role sodium intake actually plays.
Multiple Ironman athletes were hospitalised from drinking too much plain water — exercise-associated hyponatraemia. Here's how electrolytes regulate fluid balance, when plain water is insufficient during prolonged exercise, sodium replacement guidelines, and the "drink to thirst" vs. scheduled drinking debate.
The 8-glasses-a-day rule has almost no scientific basis. Here's how the body actually regulates hydration, what genuinely affects your water needs, how to use urine colour as a real-time indicator, and when the rule breaks down.
Learn how daily water intake needs are calculated, why the 8-glasses rule falls short, how climate and activity affect hydration, and how to use a free water intake calculator for a personalised target.
