Needs vary by size, heat, and activity - thirst plus pale-yellow urine beats any fixed glass count. Constant unquenchable thirst with frequent urination is a diabetes warning sign, not a hydration goal.
What to do
Common questions
How much water should I drink a day?
The 8-glasses-a-day rule is a rough average, not physiology. How much fluid you need depends on body size, activity, heat, pregnancy or breastfeeding, and even your diet - food, especially fruit, vegetables, and soup, supplies a meaningful share of daily water. Common guidance lands around 11.5 cups of total fluid a day for women and 15.5 for men from all drinks and food, but your body runs a better gauge than any chart. The practical test: drink when thirsty, and check your urine - pale yellow means well hydrated, dark yellow means drink more, consistently clear and frequent means you can ease off. The CDC suggests water as the default drink, and notes sugary drinks add calories without helping hydration needs. Coffee and tea count toward fluid despite mild caffeine. More is not always better: forcing gallons can dilute blood sodium - hyponatremia - which mostly matters for endurance athletes chugging plain water through long events. That is the scenario where electrolytes enter the picture. And one caution the other way: needing to drink constantly with unquenchable thirst and frequent urination is a diabetes warning sign worth a blood test. Pymander is a free AI doctor, 24/7 by text. It can help you judge whether your thirst pattern is normal for your routine.