this post was submitted on 17 Nov 2025
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Apparently there's on average 3.5% salt in seawater, so you could probably drink ~~1 liter~~ 100 ml daily and be fine assuming you supplement it with something "else". ~you~ ~know~ ~what..~
You can't supplement it with your urine, because your urine will be containing the salts you're trying to get rid of.
If you had an ample supply of urine from someone who was extremely well hydrated, maybe.
But yeah no you shouldn't be drinking seawater at all, it's just too salty. You're expending more water of get rid of the salt. Coffee or tea would be fine despite slight diuretic effects, but ocean water is just too salty.
...what if i'm a domestic cat?..
You won't die immediately, but there's no way that consuming 35g salt/day won't lead to severe health issues down the line ...
Yeah, you're right, it was some really shotty early morning math, I was thinking 100 ml not a whole liter.
The outcome of your typo ended up being really interesting though!
35g of salt can be a lethal dose for a human of about 70kg, so no one's going to last too long on this diet.
LD50 for a human of 70kg is 210g (3g salt per kg of human), so it seems rather unlikely that it will be lethal short-term (though always possible). It mostly becomes lethal when you don't have any water that's actually hydrating.
I think you may be thinking of the LD50 for rats. People have died from much less than 3g/kg.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5537768/
https://pmc.ncbi.nlm.nih.gov/articles/PMC3951800/
Is it pee
Not your own. Definitely not from anyone who has taken-up drinking seawater either.
Depends on rest of diet and starting conditions and duration.
Like if in a highly glycolytic diet/state... severely not advisable to do large doses of salt. But if in ketosis, you've a far higher ceiling. 3.5g's normal. 35g's likely going too far even when in ketosis.