Why does salt water dehydrate you, but saline/sodium chloride/electrolytes hydrate you?
In: Chemistry
If you drink Salt water like Sea Water then your body now have too much salt, in order to get rid of it your body uses its available water in your system to pass it through the kidneys and kick it out therefore leaving you dehydrated.
Normal water on the other hand has very minute and necessary amount of salts which is exactly what our body needs to function and it hydrates us.
Also, pure water as in 100% H2O or commonly known as Deinionized water is also going to leave you dehydrated as such water have absolutely zero salts. Such water will draw out salts from your system leaving you dehydrated.
tldr: Both Salt water and Pure water (with zero salts) are bad and will leave you dehydrated.
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