Uhhh.....yeah.
The simple answer is, drink all you want, we'll make more.
> > > I have always wondered if you drink so much water does it affect
your
> > >kidneys adversely by overworking them ?
> > >
> >
> >
> > James here.....
> >
> > It would be interesting to see what Dr John has to say, it is so nice
to
> > have him on the list. I have always understood by making urine more
dilute
> > it is better for you.
>
> Normal kidneys filter a straight percentage of the amount of blood that
> passes through it. This is an oversimplification of a process that
involves
> the amount of dissolved salts, serum proteins and blood pressure, but for
> purposes of this list, suffice it to say that a fixed fraction of the
amount
> of blood that passes through the kidney is excreted as urine. Thus, the
> more blood volume that passes through, the more urine made. The blood
> volume is increased by consumption of more fluid, but the intestines can
> absorb fluid at a fixed rate in the hydrated state (again, an
> oversimplification). If one consumes more fluid than one can absorb, the
> stool is more hydrated; if there is enough fiber, it absorbs it; if not,
the
> stool becomes loose. OTOH, intravenous fluid has no limit in how much
can
> be put into circulation.
>
> The reason there are limits to absorption is not because of the kidneys
but
> because the heart has a limit to how much it can pump through the
kidneys.
> If the limit of cardiac output is reached, fluid accumulates in higher
> volumes in the blood and the fluid pressure forces it into the tissues,
> resulting in edema. Again, orally, this is almost impossible to do in a
> healthy person.
>
> If fluid intake is maximized, urine is very dilute when it is made since
> much more water is put into the urine. If fluid intake is maximized, the
> blood flow to the mucus membranes is adequate so the mucus glands can
> produce mucus that is thinner. As the volume of blood drops, the
> circulation is reduced to noncritical organs such as the airways in favor
of
> the brain and other critical organs. Consequently the mucus gets more
> viscous.
>
> Other benefits to adequate hydration are reduced incidence of bladder
> infections for women by reducing the chance of bacterial growth to the
point
> of invasion of the bladder wall, improved perspiration for temperature
> regulation, improved skin hydration, reduced risks for stone formation in
> the kidneys and salivary glands, etc.
>
> I hope that explains it.
>
> John
>
> John J. Messmer, M.D.
> Assistant Professor, Family & Community Medicine
> Penn State College of Medicine
>
John M. Schweinfurth, MD
Laryngology and Professional Voice Care
Assistant Professor
Penn State University Medical Center
Hershey, PA
(717) 531-6822
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