How Much Water Is Safe to Drink in a Day

How Much Water Is Safe to Drink in a Day

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Ever drunk so much you sloshed? It feels like a washing machine in your gut. That’s overhydration symptoms: nausea, headache, confusion.

One man drank 10 liters in 8 hours for a radio contest. He ended up in a coma. Winning a PS2 wasn’t worth it.

But here’s the fun part: your brain has a thirst switch. It’s a cluster of neurons that scream “DRINK!” when you’re 2% dehydrated. That’s earlier than most people realize.

The Beer Myth

Does coffee dehydrate you? Nope. That’s another myth. Caffeine is a mild diuretic, but your body adjusts. Coffee counts as water—seriously.

How Much Water Should You Drink A Day How Much Water Should You DrinkHow Much Water Should You Drink A Day How Much Water Should You Drink

Beer too. But alcohol is worse because it blocks a hormone called ADH. That’s why you pee more after a pint. It’s not the water—it’s the booze.

Funny detail: if you only drink water and nothing else, you can still die. It’s called water intoxication. The Guinness World Record for “most water drunk without dying” is unclear. Because people try.

伊藤 翔太
著者

伊藤 翔太

マネー知識やキャリア形成に役立つノウハウを、初心者にも分かりやすく解説するのが得意です。