Caffeine

Er koffein vanddrivende?

Jeg har prøvet at grave lidt i den vanddrivende effekt, herunder
fundet ud af at det hedder "diuretic" på engelsk :)

Jeg er kommet frem til følgende:

* der er en teoretisk vanddrivende effekt fordi koffein nedbrydes til
  bl.a. theobromine i leveren.

* der er (måske?) en målbar vanddrivende effekt ved uregelmæssig indtagelse af
  større mængder.

* koffein får en eller anden spincter muskel til at slappe af og
  derfor skal man tisse når man indtager koffein (men det er det
  normale indhold der tømmes).

* hvis koffein indtages regelmæssigt er det ikke vandrivende, den
  bedste opsummering er denne:

http://advance.uconn.edu/2002/020722/02072207.htm

Among his findings:

    * When caffeine or a caffeinated beverage is consumed, the body retains some of
the fluid;

    * Caffeine consumption causes a mild diuresis very similar to that of water
(water, when consumed in large volume, increases urine output);

    * There is no evidence that consumption of caffeinated beverages causes a
fluid-electrolyte imbalance that is detrimental to health or exercise performance;

    * A person who regularly consumes caffeine has a higher tolerance to the
diuretic effect;

    * The determination of safety or risk of consuming caffeine and caffeinated
beverages depends on several factors, including the amount consumed and tolerance to
caffeine.

Fra selve artiklen:

Investigations comparing caffeine with water or placebo seldom found a statistical
difference in urine volume, the author wrote. "In the 10 studies reviewed,
consumption of a caffeinated beverage resulted in 0 to 84 percent retention of the
initial volume ingested, whereas consumption of water resulted in 0 to 81 percent
retention."