system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If your body is dehydrated why do you have to pee so quickly after drinking water?

You would think if your body is dehydrated that it would keep as much water as possible instead of eliminating some of it.
gpt
Part of being dehydrated is that your body refrains from processing too much waste from your blood in to our bladder because it needs to expend water to do so. When you finally start hydrating again your kidneys start going back to work.