Why does sodium-heavy liquids like pickle juice, chicken noodle soup, or saline hydrate you better than regular water when you’re dehydrated, but salt water dehydrates you?
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On a related note (or would this be fodder for a different ELI5 post), why are sour/acidic liquids (such as lemonade, sodas, switchel/haymaker’s punch, etc) more refreshing than sweeter liquids or plain water? Is it the free protons, or something else?
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