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ThePhysicsOfBaseball t1_j6ccokp wrote

Reply to comment by RixirF in ELI5: why do our bodies randomly act like we haven’t had water in days and that we need to chug a bunch randomly? by Serratedlily

Sorry, no. The way most people talk about this, it's horse shit, although that doesn't stop the myths from persisting:

https://www.cbc.ca/news/health/hydration-myths-debunked-in-5-easy-sips-1.3155705

> Bottom line: for healthy people doing normal things under everyday conditions, nature has already provided the perfect tool, precisely calibrated to replace the fluids that are lost through exertion, perspiration, urination and other excretion. > >It's called "thirst." Use it, and you can stop sweating about hydration.

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DoctorWaluigiTime t1_j6ctbkp wrote

Indeed. If thirst meant dehydration, then everyone sleeping for 6+ hours a night would be dehydrated every morning lol.

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RockinMadRiot t1_j6d1n90 wrote

But you could argue that we aren't doing as much in our sleep so using less fluid, when awake that's a different matter as we are using everything, including our brains.

Edit: just re-read, yes I agree with you. Thirst is just a sign you are starting to get low and need water, if you ignore that then very likely you will have dehydration

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