How much water is lost from our bodies from breathing? by Dr. Lonna Denny | Jul 14, 2016 | Ask Doctor Denny, Trivia | 0 comments We lose half a liter of water each day through breathing. This is the water vapor we see when we breathe onto glass. Submit a Comment Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.