Ive been fasting from any food/drinks for 14 hours prior to a surgery, but still have the urge to pee. Where do the pee came from?
In: Biology
Human are ~60% water (water), the water loss is constant: through sweat, skin pore, and piss.
Thus when you drink, what’s happening is not water converting to Piss, its to replenish the water you lost.
There still is plenty of water in your body and your kidneys still need to filter your blood to get rid of bad things. These things are usually water soluble, so the kidneys need to take some of the water in your blood to store the bad stuff in so you can pee it out. It is also part of the reason why we can survive quite some time without food but not very long without water.
Your body still generates metabolic wastes that have to be filtered out of the blood, and the kidneys never stop doing that regardless of your fluid intake.
Even when you don’t take in water, the body needs to get rid of that waste eventually, taking some of your blood’s water volume with it.
You still need to get rid of waste. If you do not, you get sick. Pee is how we do that, so even if you’re not drinking water, you’re going to pee anyway.
As for where it comes from, we are still ~60% water, so I assume it comes from that, probably from blood.
The conversion of sugars (or any food) to energy releases CO2 and H2O, so long as the body is using energy it is producing small amounts o water.
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