system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If urine color indicates hydration level, how is it that you can pee a large quantity but still have it be darker color?

Assume this is a person drinking water, not soda or alcohol or something.

EDIT: To be clear, my urine color is not concerning me.
gpt
Because the color of urine is not a reliable indicator of hydration status. Your body could be needing to get rid of a little bit more of the things that color urine. Or, the kidneys could be retaining more water to keep you hydrated. But in this case, the urine volume in the bladder will build up over time to the point that you pee a lot all at once. There are problems (such as bile duct issues) that can cause your urine to become abnormally dark (like dark tea or even coke dark).