Hydration Myths the Research Has Corrected
The "8x8" rule — eight 8-ounce glasses of water daily — has no scientific basis. Individual hydration needs vary enormously with body size, activity level and climate. Thirst is a reliable hydration guide for most healthy adults, and a wide range of beverages including coffee contribute meaningfully to daily hydration.
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Myth: coffee dehydrates you — evidence shows moderate coffee consumption is net-hydrating
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Myth: 8 glasses a day is the universal standard — individual needs vary widely
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Myth: clear urine means good hydration — pale yellow is the actual healthy target
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Truth: most foods contribute meaningfully to daily fluid intake