Think of your blood as the delivery service for your entire body. When you’re dehydrated, your total blood volume actually drops. Imagine trying to water a whole garden with just half a hose.
Your brain, being the pickiest organ around, needs a steady flow of oxygen-rich blood. When that flow slows down, it gets cranky. And how does a cranky brain complain? By triggering the vomiting center, just in case you swallowed something toxic.
It’s a defense mechanism gone haywire. Your brain thinks, “Hey, blood is low, maybe there’s a poison in here—let’s clear the stomach just to be safe.” That queasy feeling? That’s your brain hitting the panic button over a water shortage.
