Why does pee go yellow when we are dehydrated?
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Your kidneys have a few different jobs. One is to work as a filtration device that removes certain molecules from the bloodstream. Another big on is to control how much fluid is in all of your blood vessels. It does this by reacting to (and adjusting) your blood pressure.
When you don’t have enough fluid in your blood vessels (dehydrated), your kidneys know to reuse as much of the filtration fluid as possible to ensure that the stuff that’s coursing through your veins is still in liquid form (bad news if it isn’t). When that happens, the water content of your urine is reabsorbed, leaving behind a kind of urine concentrate. The filtration has still happened and all those metabolites are still in your urine, but they exist in a much more concentrated form. On the other hand, when you have excess fluid in your vessels, the mechanics of the kidneys allow all that extra fluid to proceed on to the bladder. All that extra water content dilutes the urine and makes it clear.
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