home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!network.ucsd.edu!sdcc12!jeeves!rabani
- From: rabani@jeeves.ucsd.edu (Ely Rabani)
- Newsgroups: misc.consumers
- Subject: Re: water purification/is drinking pure water bad for you?
- Message-ID: <37978@sdcc12.ucsd.edu>
- Date: 12 Sep 92 08:20:48 GMT
- References: <PHR.92Sep9125307@soda.berkeley.edu> <Sep.11.17.12.27.1992.29068@andromeda.rutgers.edu>
- Sender: news@sdcc12.ucsd.edu
- Distribution: usa
- Organization: University of California, San Diego
- Lines: 49
- Nntp-Posting-Host: jeeves.ucsd.edu
-
- In article <Sep.11.17.12.27.1992.29068@andromeda.rutgers.edu> dmr@andromeda.rutgers.edu (Daniel Rosenblum) writes:
- >
- >You may be confusing this with the question of soft vs. hard water.
- >Soft water is more likely to dissolve certain metals in the pipes
- >(I have a vague recollection that it's more acidic than hard water,
- >but I wouldn't bet on this), so if your pipes are old and have lead
- >solder, soft water is more likely to contain dissolved lead. But
- >I've never heard anyone claim that the mineral content of hard water
- >is enough to do you any good or harm. (Yes, there are a few odd
- >exceptions here and there: for instance, moderate levels of naturally
- >occuring fluorides will help prevent tooth decay in kids who drink
- >the water, and really high levels can cause tooth mottling, but
- >these aren't all that common.)
- >--
- >Daniel M. Rosenblum, Assistant Professor, Quantitative Studies Area,
- > Graduate School of Management, Rutgers University (Newark Campus)
- >ROSENBLUM@DRACO.RUTGERS.EDU ROSENBLUM@ZODIAC.BITnet
- >dmr@andromeda.rutgers.edu ...!rutgers!andromeda.rutgers.edu!dmr
-
- Actually, an important point is that the naturally occuring F- levels
- mentionned exert this effect by providing trace levels for enamel
- mineralization, not by poisoning bacterial metabolic enzymes, as does
- the F- in toothpaste.
-
- According to my frosh chem text, incidentally, water fluoridation was
- initially proposed by chemical companies with lots of waste F- that
- was costing them to dispose...hey, let's dump it in the water supply!
-
- No, I'm not railing against any communist plot to poison our vital
- bodily fluids, Dr. Strangelove, just pointing out a historical irony.
-
- On the other hand, some municipalities use Al(OH)3 in their water
- purification protocols. There was a study in Lancet about three years
- ago correlating some putative diagnosis (whose validity in this
- application was disputed by detractors of this paper) of Alzheimer's
- geographical distribution with Al+3 concentration in the water supply.
- A medline search, yeilded abstracts which mostly concurr with this
- suspicion. (If anyone is interested, e-mail request for text, or search
- F KW ALUMINUM AND KW WATER AND KW ALZHEIMER.)
-
- Interestingly enough (and I only did that search after starting the last
- paragraph) one abstract discussed a negative correlation between F-
- concentration in water and Alzheimer's incidence--should be an
- interesting read--putatively due to asorbtive competition.
-
- Ely.
-
-
-
-