It isn’t really that salt hydrates you, it’s that your body needs salt to function and salt is one of the things the body loses when you become dehydrated (for example by sweating). The symptoms typically associated with dehydration are in part caused by a lack of electrolytes such as salt.
But in general the body doesn’t want too much salt in it. Your kidneys will work to get rid of excess salt, but they’re only so efficient. If you drink sea water they’ll be overwhelmed and you’ll have, physiologically speaking, a very bad time
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