How much water should you actually drink? Scientific explaination of human daily water requirement

8 glasses of water a day — you've heard it your whole life, but where did that number actually come from, and does hydration science actually back it up? In this video we trace the "8x8 rule" back to a misread 1945 government bulletin, show why a 2002 scientific review found zero evidence behind it, and break down what the National Academies of Medicine actually recommends for daily water intake — plus the real risks of both under- and over-hydrating. You'll learn: • The real origin of the "8 glasses a day" myth (it's not what you think) • What current hydration science actually recommends • Why thirst is a more reliable guide than any fixed number • The surprising danger of drinking too much water (hyponatremia) • A simple, doctor-backed way to check your hydration in seconds Chapters: 0:00 The glass-counting anxiety 0:30 Where "8 glasses a day" really started 2:30 The scientist who fact-checked it 3:30 What hydration science actually says 5:30 Can you drink too much water? 6:00 The one test that actually works 6:30 Final takeaway If this changed how you think about your water bottle, subscribe for more everyday health myths, broken down with the actual science behind them. #HydrationMyth #HealthMyths #WaterFacts #Hydration #ScienceExplained #MythBusting References Food and Nutrition Board, National Research Council (1945) — original "2.5 liters daily, most contained in prepared foods" water allowance statement Valtin, H., American Journal of Physiology (2002) — "Drink at least eight glasses of water a day"; review finding no scientific evidence for the 8×8 rule National Academies of Sciences, Engineering, and Medicine / Institute of Medicine (2004) — Dietary Reference Intakes for Water, setting adequate intake at ~3.7L/day (men) and ~2.7L/day (women) Almond, C.S. et al., New England Journal of Medicine (2005) — hyponatremia among Boston Marathon runners Scientific American (2007) — reporting on the Jennifer Strange water-intoxication death CDC national survey data on U.S. adult plain-water consumption UK NHS Eatwell Guide — 6–8 cups/glasses fluid guidance 8 glasses of water a day, how much water should I drink, water myth, hydration myth, how much water per day, drink 8 glasses of water, water intake myth, hydration science, how much water do you need, water myth debunked, dehydration myth, thirst mechanism explained, national academies water intake, hyponatremia, water intoxication, health myths debunked, nutrition myths, myth busting health, hydration tips, urine color hydration test, is 8 glasses of water true