7 hydration myths that can harm your health

Overhydration and electrolyte imbalance can cause serious harm, including rare fatalities, despite common hydration advice sounding safe. Widely repeated myths, such as fixed water intake targets, increase these risks. Thirst is a reliable hydration signal, and overriding it with scheduled drinking has caused exercise-associated hyponatremia in endurance athletes. Clear urine indicates overhydration; pale yellow is the healthy target. Caffeinated drinks contribute to hydration, and sports drinks are only needed for exercise exceeding an hour. Symptoms like headache or confusion may indicate hyponatremia, not dehydration, making more water harmful. Kidneys excrete only about 800-1000 milliliters per hour, and exceeding this can be fatal, proving water has an excess risk alongside deficiency.