Have you been fooled for years by the claim that you need to drink 8 glasses of water a day?
Recently, “drink big water” has become a viral internet meme: young people use “big water” as shorthand for “a large amount of plain water,” and 1.5- or even 2-liter water jugs are selling out—finish one jug and you’ve hit your daily target.
But yesterday (10-20), the Shanghai Center for Disease Control and Prevention poured cold water on the trend: don’t rigidly stick to a set amount; hydrate according to your needs.
A few hard truths:
1. “You must drink 8 glasses of water every day” is taken out of context. The claim comes from an old 1945 recommendation by the U.S. Food and Nutrition Board. The very next sentence said, “Most of this amount is contained in food”—so water from fruit, vegetables, and soup counts too. Scholars published articles correcting this claim in both 2002 and 2023, arguing that the bottled-water industry helped perpetuate it for decades.
2. How could a 50-kilogram woman and a 90-kilogram man possibly need the same amount of water? A one-size-fits-all drinking target is inherently unscientific. The figures in guidelines are just a reference: in a mild climate, adult men need about 1,700 milliliters a day and women about 1,500 milliliters. If you exercise and sweat, you’ll need more.
3. Drinking too much water really can “poison” you. Medically, it’s called dilutional hyponatremia: sodium in the blood becomes diluted, and in severe cases, brain cells swell. This June, a 25-year-old woman in Zhengzhou tried to “substitute water for alcohol” at a drinking party. She became confused, convulsed, and fell into a coma. She was diagnosed with water intoxication, and doctors said that without timely treatment, she could have suffered brain death.
The Shanghai CDC’s way to tell if you’re hydrated is very simple: check the color of your urine. Pale lemon yellow = you’re well hydrated; keep it up. Slightly darker yellow = time to drink. Dark yellow or amber = clearly dehydrated; drink two or three glasses. The color of oolong tea = severely dehydrated; seek medical care if necessary.
The right approach comes down to eight words: drink small amounts often, spread them evenly throughout the day. Have a glass in the morning and evening, and another every 1–2 hours at other times. Sip slowly, and don’t wait until you’re thirsty to gulp down a lot.
My take: when it comes to wellness, the biggest danger is going overboard. We used to guzzle milk tea; now we’re guzzling plain water. It’s just one extreme swapped for another. When it comes to drinking water, listening to your body is more reliable than following a slogan.
Roughly how much water do you drink each day? Did you buy one of those 1.5-liter jugs too?
Sources: The Paper, “Has ‘drink big water’ gone viral? Shanghai CDC: Don’t rigidly stick to a set amount; check your urine to see whether you need to drink” (2026-10-21); ifeng.com, “’Drink big water’ has gone viral—but what exactly is ‘big water’? Shanghai CDC issues urgent reminder: don’t get it wrong” (2026-10-21); original post from the “Shanghai CDC” WeChat account on 10-20. The core of the meme comes from the online trend “drink big water”; it has been reproduced directly without rewriting. The accompanying image is a photograph (mensjournal), used for illustration only.
Recently, “drink big water” has become a viral internet meme: young people use “big water” as shorthand for “a large amount of plain water,” and 1.5- or even 2-liter water jugs are selling out—finish one jug and you’ve hit your daily target.
But yesterday (10-20), the Shanghai Center for Disease Control and Prevention poured cold water on the trend: don’t rigidly stick to a set amount; hydrate according to your needs.
A few hard truths:
1. “You must drink 8 glasses of water every day” is taken out of context. The claim comes from an old 1945 recommendation by the U.S. Food and Nutrition Board. The very next sentence said, “Most of this amount is contained in food”—so water from fruit, vegetables, and soup counts too. Scholars published articles correcting this claim in both 2002 and 2023, arguing that the bottled-water industry helped perpetuate it for decades.
2. How could a 50-kilogram woman and a 90-kilogram man possibly need the same amount of water? A one-size-fits-all drinking target is inherently unscientific. The figures in guidelines are just a reference: in a mild climate, adult men need about 1,700 milliliters a day and women about 1,500 milliliters. If you exercise and sweat, you’ll need more.
3. Drinking too much water really can “poison” you. Medically, it’s called dilutional hyponatremia: sodium in the blood becomes diluted, and in severe cases, brain cells swell. This June, a 25-year-old woman in Zhengzhou tried to “substitute water for alcohol” at a drinking party. She became confused, convulsed, and fell into a coma. She was diagnosed with water intoxication, and doctors said that without timely treatment, she could have suffered brain death.
The Shanghai CDC’s way to tell if you’re hydrated is very simple: check the color of your urine. Pale lemon yellow = you’re well hydrated; keep it up. Slightly darker yellow = time to drink. Dark yellow or amber = clearly dehydrated; drink two or three glasses. The color of oolong tea = severely dehydrated; seek medical care if necessary.
The right approach comes down to eight words: drink small amounts often, spread them evenly throughout the day. Have a glass in the morning and evening, and another every 1–2 hours at other times. Sip slowly, and don’t wait until you’re thirsty to gulp down a lot.
My take: when it comes to wellness, the biggest danger is going overboard. We used to guzzle milk tea; now we’re guzzling plain water. It’s just one extreme swapped for another. When it comes to drinking water, listening to your body is more reliable than following a slogan.
Roughly how much water do you drink each day? Did you buy one of those 1.5-liter jugs too?
Sources: The Paper, “Has ‘drink big water’ gone viral? Shanghai CDC: Don’t rigidly stick to a set amount; check your urine to see whether you need to drink” (2026-10-21); ifeng.com, “’Drink big water’ has gone viral—but what exactly is ‘big water’? Shanghai CDC issues urgent reminder: don’t get it wrong” (2026-10-21); original post from the “Shanghai CDC” WeChat account on 10-20. The core of the meme comes from the online trend “drink big water”; it has been reproduced directly without rewriting. The accompanying image is a photograph (mensjournal), used for illustration only.