How much water should I actually drink a day?
Answered by the AskDoc Medical Team · Medically reviewed under our Medical Director, MBBS
The eight-glasses rule is folklore; needs vary with size, climate, activity and diet, and food supplies about a fifth of fluid. The built-in gauge works: drink when thirsty, and aim for pale-yellow urine, the single most honest hydration indicator.
Heat, exercise, fever, vomiting and breastfeeding raise needs sharply; older adults blunt their thirst signal and benefit from scheduled drinking.
More is not endlessly better, extreme forced drinking dilutes sodium dangerously. Kidney stones, recurrent UTIs and some conditions change targets individually; that is a doctor conversation, not a gallon-jug challenge.
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