system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If most water is absorbed in the colon, then why does thirst resolve immediately after drinking?

I've been taught that most water in the human GI tract is absorbed in the colon, which is pretty far down the tract from the mouth. So why is it that thirst almost immediately resolves upon having a drink?
gpt
Yes, but it's your brain and not your colon that makes the decision of whether you feel thirsty or not. There are  whole lot of times there will be a disconnect.

Consider the experiments with infinite soup bowls. People will eat more when offered bigger portions, regardless of hunger, and if you covertly keep filling up their soup bowl, they will very rarely stop.