Water Loss by Breathing
Location: Outside U.S.
Date: Spring 2013
In an average eight hour sleep period ,normal home, how much moisture would a 200 lb man lose in ounces of water by breathing only?
Thanks for the question. The rule of thumb that I have remembered is
that one loses half a cup of water per day by breathing. Of course,
this is only approximate. So, I would expect that a person might lose
one-third to one-half of a cup of water by breathing during an eight
hour sleep period.
I hope this helps. Please let me know if you have more questions.
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Update: November 2011