Your body doesn’t know why you’re dehydrated; it’s kind of operating on the assumption that you’re taking care of it by eating and drinking the right amounts. So when your body feels hungry or thirsty for too long (starvation/dehydration), it assumes that something’s gone very wrong, so it does all kinds of things to say “hey! put water in me!”
You might throw up in case the cause of dehydration is a toxin you’ve ingested, or simply because your body is trying to make you realize something’s wrong; throwing up is a painful, sudden, and obvious sign that you’re sick and need to rest and hydrate.
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