If your kidneys could produce a sufficiently concentrated urine to “steal” H2O from seawater, you could drink seawater and hydrate yourself with it. A small australian mouse can do that (crazy kidneys). You, as a human, can’t. You are effectively introducing a sodium load so large that your body will need to GIVE WATER TO IT in order to expel it. That’s why you dehydrate yourself really fast if you drink seawater.
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