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Subject:
human physiology
Category: Health > Fitness and Nutrition Asked by: barbara53-ga List Price: $5.00 |
Posted:
09 Oct 2003 07:37 PDT
Expires: 08 Nov 2003 06:37 PST Question ID: 264558 |
Why does my body weight go down 2-4 lbs overnight? Even if I urinate once, it couldn't account for that much loss. Could that much be lost in respiration and transpiration? |
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Subject:
Re: human physiology
Answered By: bobbie7-ga on 09 Oct 2003 08:34 PDT |
Hello barbara53, Your body weight decreases overnight due to a loss of body fluids or water. The body may lose fluids in a variety of ways: Urine Lungs - breathing Skin- perspiration Feces The Australian Kidney Foundation http://www.kidney.org.au/renal_resources/fact_sheets/dehydration.pdf When you wake up you will often be thirsty because your body loses water while you are sleeping through breathing and perspiration. http://www.simple-living-tips.com/weight-loss.html The Textbook of Medical Physiology illustrates your bodys daily fluid loss as follows: Urine: 1400 ml/day or appoximately 3.3 pounds - normal daily urine loss at normal temperature. Lungs: 350 ml/day at normal temperatures or approximately 3/4 pound When your body converts food materials to energy, CO2 and water vapor are released to the blood stream that ultimately may leave through the lungs. Water lost through the lungs amounts to approximately. Skin: The skin loses another 350 ml/day to insensible perspiration (that which you do not notice as liquid water but evaporates directly into the air). The sweat you do notice as liquid is lost at a rate in proportion to the surrounding temperature and the level of activity. Normal temeprature with little activity can produce approximately 100 ml/day this way while under prolonged heavy exercise this number may go up to 5000 ml/day or 11 pounds. Total fluid loss: between 2400 and 6700 ml/day which is about 6 -15 pounds. If one third of this occurs at night, the body weight loss could be in the range of 2 to 3 pounds. Textbook of Medical Physiology W.B. Saunders Co. Philadelphia, PA 1976 http://www.madsci.org/posts/archives/jan2001/978977130.An.r.html Here is a table from the Southern Africa Union Conference. Fluid Loss Normal Hot Heavy Exercise Invisible loss Skin 350 350 350 Invisible loss Lungs 350 250 650 Visible Loss Urine 1400 1200 500 Visible Loss Sweat 100 1400 5000 Visible Loss Feces 200 200 200 Total 2400 3400 6700 Southern Africa Union Conference http://www.adventist.org.za/Departments/health_files/celebration/Water.doc Search Criteria: Weigh less in the morning Overnight water loss Lose *mls per day through lungs Fluid loss overnight I hope this helps. If anything is unclear with my answer, please ask for clarification. Best Regards, Bobbie7-ga |
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