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The kidneys
filter hundreds of litres of blood per day (approximately 1700
liters). The greatest part of the filtered urine, the so-called 'pre-
urine', is di-rectly reabsorbed into the blood. Excess substances and
the end products of nitrogen and protein me-tabolism together with
water form the one to two litres of excreted urine-. The kidneys are
not intended to remove poison-ous substances from the body - the
liver, intestines, skin and exhalation take care of this. Obviously,
the food you consume finds its way into the blood, and therefore into
the urine, which is why it is im-portant to follow a healthy diet.

Urine is a sort of infor-mation card which registers the condition of
the blood. When that information is carried back to the body, the body
can consequently react according to this feedback; it will normally do
this in an appropriate and precise way. The body is an extremely
advanced and intelligent sys-tem.

The intestines donot absorb all the substances we consume and they are
able to make a selection. To a certain extent, they select what is
useful to the body and excrete the rest through defecation. Certain
substances are converted by the