system
Given the following post, respond as if you're commenting on Reddit:
human
How come I can eat salt and drink water but I can't drink salt water?
gpt
Seawater is very salty.  About 3.5%, which makes that pint of water you have with dinner about 17g of salt.  The RDA of salt is around 6g, so in that one glass you have three days worth.  When you drink it, your cells dump out water to try and balance the salt levels in your cells and your blood and you essentially dehydrate.

Water with a little bit of salt in it is fine, and can be found in diarrhoea treatments.