Here’s the funny part: your kidneys are basically OCD bouncers. They maintain a perfect balance of water and salt. When you chug a Coke, they go, “What is this neon brown chaos?”
They kick into overdrive to flush out the excess sugar and caffeine. But in doing so, they flush out more water than the soda provided. Net loss. You are now less hydrated than before you drank it.
That’s why you can drink a whole liter of soda and still feel parched. You’re basically paying the dehydration tax.