While not a doctor, I can give you a general answer for
this.
About 1/2 of blood is water, and the other half is
"good goo." The water is important to carry the "good goo" around and help carry bad
stuff away from cells. Your body is designed to work with blood that has a very
particular make-up in the same way that a car will only go when filled with gas that's
made the right way; you can't just mess with it and expect for the car to still
go.
Anyhow, your body wants that particular blood design,
and since water is such a big part of it you need the right amount. If you have too
much water then you have a situation some people call "water intoxication." Basically,
when you sweat you lose salt (which is part of the "good goo.") That's okay, because we
generally don't sweat a ton and we eat plenty, so we put salt back in. But if the salt
level goes down too much and you keep putting water into your body, the blood won't work
right. You need the salt level to be constant in order for your nerves and muscles to
function correctly. That's not really a problem of having "too much water" in your
blood (that's not really possible, you'd just pee out the extra water) but more a case
of having blood that is too diluted.
The opposite is a
nasty situation called "Hypovolemia." This happens during dehydration. In this
situation, you don't have enough water to keep the "good goo" floating well. Your blood
doesn't transport oxygen well enough and your body re-directs the limited blood supply
to vital organs rather than the skin. This makes it harder to lose heat, which can cause
all sorts of troubles if you are exercising.
You can even
end up with blood that is TOO salty, your blood pressure will soar, and you'll end up
having a heart-attack as your blood pressure rises too
high.
So, as you can see just like you can't mess with
gasoline you can't mess with blood. It is designed to have a very certain balance, and
if you change its composition it won't be able to do the job it is supposed to
do.
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