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Edited: I was wrong, the balance varies quite a bit by species. Reptiles and birds are far more water efficient than large mammals becasue they do not lose water through sweat or urine. There are animals that are metabolically water neutral, but humans are not one of them. In humans the water produced metabolically does far exceed the water used metabolically. source 1source 2

In humans there are three main ways water is take in, drinking, injection (food), and a net metabolic production. There are four major losses, urine, sweat, respiration, and feces. so it is through one of these four methods.

Edited: I was wrong, the balance varies quite a bit by species. Reptiles and birds are far more water efficient than large mammals becasue they do not lose water through sweat or urine. There are animals that are metabolically water neutral, but humans are not one of them. In humans the water produced metabolically does far exceed the water used metabolically. I should have realized that reptile also produce less water. source 1source 2

In humans there are three main ways water is take in, drinking, injection (food), and a net metabolic production. There are four major losses, urine, sweat, respiration, and feces. so it is through one of these four methods.

Edited: I was wrong, the balance varies quite a bit by species. Reptiles and birds are far more water efficient than large mammals becasue they do not lose water through sweat or urine. There are animals that are metabolically water neutral, but humans are not one of them. In humans the water produced metabolically does far exceed the water used metabolically.

In humans there are three main ways water is take in, drinking, injection (food), and metabolic net output. There are four major losses, urine, sweat, respiration, and feces.

Edited: I was wrong, the balance varies quite a bit by species. Reptiles and birds are far more water efficient than large mammals becasue they do not lose water through sweat or urine. There are animals that are metabolically water neutral, but humans are not one of them. In humans the water produced metabolically does far exceed the water used metabolically. source 1source 2

In humans there are three main ways water is take in, drinking, injection (food), and a net metabolic production. There are four major losses, urine, sweat, respiration, and feces. so it is through one of these four methods.

It is not expelled, all of it is used in other biological processes. That is why you still need to drink water becasue the body uses more water than it produces. Hydrolysis is everywhere in biochemistry.

water is used up in digestion, it is expelled through respiration, lost through sweat and urine, ATP usage, ect.

Edited: I was wrong, the balance varies quite a bit by species. Reptiles and birds are far more water efficient than large mammals becasue they do not lose water through sweat or urine. There are animals that are metabolically water neutral, but humans are not one of them. In humans the water produced metabolically does far exceed the water used metabolically.

In humans there are three main ways water is take in, drinking, injection (food), and metabolic net output. There are four major losses, urine, sweat, respiration, and feces.