Like, I know our body absorbs a bit of the water but idk 😅
In: 0
No, not necessarily.
Water participates *a lot* in the actual chemistry your body does. It’s not around just to help the chemistry happen.
For example, your body may turn some of the glucose in your food into glycogen, which is a bunch of glucose molecules chained together more or less for storage. That process of chaining glucose molecules together ends up with water as one of its outputs. When you need to break glycogen apart, your body uses water to do it. The hydrogen and oxygen become part of the glucose molecules.
Reactions where water participates like this are all over your body. Your body is constantly making and using water. This leads to the amount of water entering and leaving your body not necessarily being equal over any length of time.
At an even more basic level, urine isn’t the only way water leaves your body, though.
Water also leaves through sweat, through our breath, like when you breathe on a cold surface and see condensate, and a bit through runny nose and tears. Additional water is produced from chemical breakdown of dry food.
If you hadn’t consumed water for several days of dry fasting, you might not urinate after drinking a few liters because the body is absorbing it. But after it is “full,” the water has nowhere to go but out through all these channels.
Drinking 1 liter of water does not necessarily result in excreting exactly 1 liter of urine. The amount of urine produced depends on various factors, including individual hydration levels, activity levels, and overall health. Some of the water is absorbed by the body for various physiological processes, while the excess is eliminated as urine to maintain proper fluid balance. The volume of urine produced can vary from person to person and can be influenced by factors like diet and environmental conditions.
If you are in the hospital and have a catheter in, the nurses will monitor what’s called I&O, or In & Out. They’re basically taking a rough estimate of how much fluid you’re consuming vs how much urine is ending up in that bag at the end of the cath. They do this because you should ROUGHLY be peeing out about a much as you take in. If you’re taking in 1 L/day, but only urinating half of that, then the doc needs to figure out why. Are your kidneys malfunctioning? Is there a bladder problem? Whatever, something isn’t right. If you’re taking in 1 L, and urinating 0.7 L, you’re probably fine, absent other symptoms that something may be wrong (flank pain, urethral burning, abdominal distension, etc.)
That’s to say, it’s not a perfect 1:1, but it should be relatively close
Your metabolism breaks down sugars, which produce carbon dioxide, lost in your breathing, and water, which ends up going through your kidneys.
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