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I was always under the impression that you should not drink urine as it will hasten dehydration. I was watching Man vs. Wild (I know, this guy does some really stupid stuff) and he drank urine. Was I wrong?
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You could distill the urine and have pure water. This is what's done on spaceships !!
I will now share some information from a book "Surviving the Extremes" by Kenneth Kamler, MD.
Dr. Kamler goes into the physiology of dying, and surviving, in extreme environments. Dr. Kamler is somewhat more credible that the TV actor referenced earlier in this thread.
1 - Salts in urine never become as concentrated as salts in the blood. Drinking urine causes a decrease, not increase in salinity of body fluids. (p 145) This is in sharp contrast to seawater, which is about 3 times saltier than blood. (p108) In order for drinking seawater to result in a net decrease in salinity you have to dilute it with at least twice as much fresh water. (as Thor Heyerdahl did in his Atlantic crossing on the Ra II)
2 - Urine does contain a high concentration of urea, and drinking it exclusively for long periods may damage the kidneys. (p145)
3 - Dr. Kamler documents 2 cases of almost unbelievable desert survival in which the survivors drank their own urine. One was Mauro Prosperi, who survived nine days in the Sahara and crossed 130 miles of desert after his water ran out. The other was Pablo Valencia, who survived 7 days in the Mojave after his water ran out. Valincia's urine dried up on day 5. Both these tales as well as the physiology of dying of thirst and overheating, are detailed in the desert chapter.
In the final analysis, although it is socially taboo, drinking urine may provide a means of surviving some otherwise unsurvivable situations. As Ron alludes, there may be a price to pay in organ damage.
I found Ron Hood's post #11 in that thread to be much more credible. Read the entire thread, good discussion.This post on Ron Hood's Survival.com board deals with this issue. For what it's worth, a member of that board with the username "Howard Wallace" offers this info: . . . big quote . . .
Btw, Ron Hood offers some observations about Bear Grylls, too, based on Hood's work on the pilot ep ("Rocky Mountains").