[delightful]

“Human kidneys can only make urine that is less salty than salt water. Therefore, to get rid of all the excess salt taken in by drinking seawater, you have to urinate more water than you drank. Eventually, you die of dehydration even as you become thirstier.”

SOURCE: https://oceanservice.noaa.gov/facts/drinksw.html

[corpmedia]

But hey, how about the salt that is sweat out and used for a number of body-functions. On the Kontiki expedition, they calculated that if they did not eat any salt in the food, they could add 1/3 ocean water to they drinking water.

[cafard]

I read in a runners magazine years ago that one's sweat is less salty than one's blood. This was in the course of recommending against electrolyte drinks.