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James Katz
Tue, Aug-13-02, 05:59
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Newspaper articles, health and beauty magazines all advise
drinking at least 8 full glasses of water a day totaling 64
ounces for optimal health -- an approach called "8x8" by
proponents.

But Dr. Heinz Valtin of Dartmouth Medical School in New
Hampshire said there is no scientific evidence to back up
this advice, which has helped create a huge market for
bottled water.

"After 10 months of careful searching I have found no
scientific evidence that supports '8x8'," Valtin, who has
written textbooks on the subject of human water balance, said
in a telephone interview.

Writing in the American Journal of Physiology, Valtin, a
kidney specialist, said people forget that the food they eat
also contains some water.

For More Details:

No Need for all that water

--
Jim

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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html> Newspaper articles, health and beauty magazines all
advise drinking at least 8 full glasses of water a day
totaling 64 ounces for optimal health -- an approach called
"8x8" by proponents.
<p>But Dr. Heinz Valtin of Dartmouth Medical School in New
Hampshire said there is no scientific evidence to back up
this advice, which has helped create a huge market for
bottled water.
<q>"After 10 months of careful searching I have found no
scientific evidence that supports '8x8'," Valtin, who has
written textbooks on the subject of human water balance,
said in a telephone interview.
<r>Writing in the American Journal of Physiology, Valtin, a
kidney specialist, said people forget that the food they
eat also contains some water.
<s>For More Details:<a href="http://story.news.yahoo.com/news-
?tmpl=story2&cid=570&e=2&u=/nm/20020809/sc_nm/health_water-
_dc_3"></a>
<t><a href="http://story.news.yahoo.com/news?tmpl=story2&cid=-
570&e=2&u=/nm/20020809/sc_nm/health_water_dc_3">No Need for
all that water</a> <br>&nbsp;
<u>--
<br>Jim</html>

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Stephen Di
Tue, Aug-13-02, 05:59
In article <3D58199B.DE1061E3@us.ibm.com>,
James Katz <Jakatz@us.ibm.com> wrote:

> Newspaper articles, health and beauty magazines all advise
> drinking at least 8 full glasses of water a day totaling 64
> ounces for optimal health -- an approach called "8x8" by
> proponents.
>
> But Dr. Heinz Valtin of Dartmouth Medical School in New
> Hampshire said there is no scientific evidence to back up
> this advice, which has helped create a huge market for
> bottled water.
>
> "After 10 months of careful searching I have found no
> scientific evidence that supports '8x8'," Valtin, who has
> written textbooks on the subject of human water balance,
> said in a telephone interview.
>
> Writing in the American Journal of Physiology, Valtin, a
> kidney specialist, said people forget that the food they eat
> also contains some water.
>
> For More Details:
>
> No Need for all that water
>
>
> --
> Jim

What I don't understand is that, as the good doctor is a
kidney specialist, one would have hoped that he would address
the evidence that the amount of water consumed correlates
negatively with the development of kidney disease. It is
_that_ evidence, more than anything, I think, which gave raise
to the advice to drink as much water as you can comfortably
force down. It is this advice, not some stupid figure of eight
glasses, which is really important.

It has also been widely reported that a large part of the
population typically walks around dehydrated. One would like
to know about the truth of this claim.

The fact that 5 glasses might suffice doesn't mean that 8
might not be better, and vague but plausible intutions about
diluting toxins will (rationally) govern many persons'
behavior unless the question of optimality is addressed, not
just sufficiency.

Dr. Valtin made a strong point in arguing in evolutionary
terms that it would be maladaptive if thirst did not
precede dehydration. But many functions governed by
natural mechanisms have been partially superseded in
humans by conscious adaptations, not _necessarily_ for the
better. (The fact that my dog could run far more
gracefully than I comes to mind. The cortex seems to get
in the way of the most graceful movement, and may get in
the way of the most expeditious signaling of thirst.)

Stephen Diamond