https://www.nytimes.com/2017/05/08/health/salt-health-effects.html
A couple of paragraphs from there;
The body relies on this essential mineral for a variety of functions, including blood pressure and the transmission of nerve impulses. Sodium levels in the blood must be carefully maintained.
If
you eat a lot of salt — sodium chloride — you will become thirsty and
drink water, diluting your blood enough to maintain the proper
concentration of sodium. Ultimately you will excrete much of the excess
salt and water in urine.
The theory is intuitive and simple. And it may be completely wrong.
New studies of Russian cosmonauts, held in isolation to simulate space travel, show that eating more salt made them less
thirsty but somehow hungrier. Subsequent experiments found that mice
burned more calories when they got more salt, eating 25 percent more
just to maintain their weight.
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