Why does drinking a certain amount of water turn into SO much more urine?
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Your body has a preferred level of hydration. This balances blood pressure, how “thick” your blood is, how hard your kidneys have to work, etc. If you drink a lot of water you overshoot that preferred hydration level; this can affect many things up to and including how brain cells work. If there’s too much water in your system, your kidneys just flush it out to keep you balanced.
1. It probably doesn’t and you’re over estimating how much you’re pissing 2. If you actually do piss a substantial amount more that you drink get help and 3. If it’s somehow actually normal to piss more fluid than you drink I would assume it’s due to the other things in piss your kidneys filter out.
“There are many reasons why someone might urinate more than they drink. It could be a sign of a medical condition, such as diabetes or kidney disease. Or, it could be due to medications that increase urine output.
But in most cases, it’s simply because we’re not drinking enough fluids during the day. Dehydration is one of the most common causes of increased urination. When we don’t drink enough fluids, our bodies try to compensate by increasing urine production.
This can lead to frequent trips to the bathroom and strong urges to urinate, even if we only recently emptied our bladder.”
I’m skeptical that the question is based on a true premise.
If your body has excess water to start with, then you may urinate more than you drink, because your body needs a certain amount of hydration and it was going to get rid of that excess water anyway before you drank more.
Alcoholic drinks contain water, but the alcohol dehydrates you and causes you to lose more water. I’ve heard (never actually looked it up) that it is possible to drink a pint of beer and pee out more than a pint over the next couple of hours, due to the dehydration effect from alcohol.
But generally, the water you take in by drinking and eating (most food has a high proportion of water) doesn’t all go out in the urine. Some goes out with sweat, and evaporation from breathing.
As you dehydrate, your body “thickens” liquids inside the body, to include blood.
As you rehydrate, your body returns the internal liquid of your body to the normal amount while using some of that water to remove toxins via urination. This takes time.
Once your body is back to normal “viscosity” internally, and you don’t have an abundance of toxins to remove, you begin to just pass the water you’re drinking as clear urine.
You drink as much liquid per day as you lose through evaporation (breath and sweat), urination and defecation. This is called water balance.
https://med.libretexts.org/Courses/Metropolitan_State_University_of_Denver/Introduction_to_Nutrition_(Diker)/07%3A_Nutrients_Important_to_Fluid_and_Electrolyte_Balance/7.03%3A_Regulation_of_Water_Balance
Water is so important to life because it’s really good at dissolving things. When things are floating around instead of just sitting still, it’s easier for the chemistry of life to happen.
But *too* much water means it’s less likely for those particles to interact and do the chemistry things. So a balance is important. When you have too much water, the body just dumps it.
That’s why sports drinks like gatorade exist. It has a bunch of stuff dissolved in it, which helps the body keep the water (and also replenishes what you lose through sweat).
(Also, the body doesn’t want cells absorbing too much water because of osmosis and popping).
Because you drink faster than you pee. A gulp of water brings in up to 100 ml of water, depending on mouth size, and if you’re thirsty you might take a gulp every 2 seconds, maintaining a rate of ~50ml/sec.
Urination evacuates water at a rate of ~16ml/sec, with added volume from the salts and debris it’s flushing from your body. As such, you’re going to spend at least three times as long peeing out the water as you did drinking it
You get about 20% of the water you need from food. Also urine obviously contains waste, mostly in the form of urea. Also your body retains a certain amount of fluid for homeostasis. These factors combined can mostly explain your question.
The average stomach holds about twice as many mL of fluid as the average bladder. So if you drink to capacity that’s two bladder fulls
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