If urine is produced by the kidneys filtering water from blood – not directly connected to the digestive system – why do we feel the need to pee immediately after chugging water?

Question

Another bonus question about urine, while I’m pondering the subject: when we are very hydrated, urine looks extremely clear, almost like water. If you are essentially just taking water in and peeing water out when you are very hydrated, is it even worth drinking water at that point? Like, are there diminishing returns to the amount of hydration we can get? (I know there’s those extreme cases of dying from drinking too much water, but that’s not what I’m talking about here)

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Answer 1

You’re not just peeing out water, it’s also full of salts, ions, and minerals that your body wants to regulate the level of. Overhydration can cause issues maintaining the concentration of things like ions and minerals, but you have to drink a lot of water to get to that point.