system
Given the following post, respond as if you're commenting on Reddit:
human
If alcohol makes you dehydrated, why is urine clear in colour (while drinking a lot), which indicates that you're hydrated?

During a big night out, most of us guys will know that our urine gets clearer in colour the more we drink. I got taught that clear urine means that you're hydrated. So, how come we get dehydrated from alcohol?

Are we just urinating all the water that's in the alcohol, leaving all the sugars etc. which makes us dehydrated overnight?
gpt
Alcohol reduces the production of a hormone called vasopressin, which tells your kidneys to reabsorb water rather than flush it out through the bladder. So once you have drank enough alcohol you stop absorbing the water from what you are drinking and it just goes right through you, which is why your urine is colourless but you are also dehydrated.