First, let’s bust a common myth. That water you just swallowed doesn’t zip straight to your bladder like a waterslide. It has to hit your stomach, get absorbed into your bloodstream, get filtered by your kidneys, and then go south.
So why do you feel the urge so fast? The answer is a brilliant sensory trick your nervous system plays on you. It’s not the water you just drank—it’s your body reacting to the idea of water.