ffiffi#
Shu
Jin
Rong
JOTTINGS
ON
CALCIUM
SUPPLEMENTS
Osteoporosis
(fragile
bones)
is
related
to diminishing sex hormones
-
from the age of 40,
osteoporosis begins.
ln
women,
by 65,
30-80%
are
osteoporotic; W
70,
40%
have fractures.
Vitamin
D
enhances
calcium
absorption.
Deficiency
occurs
with
intestinal malabsorption
or
chronic liver
diseases, requiring supplements. As
the Asian diet seldom consists
ol
leav-
ened bread, vitamin D2 (calciferol)
supplements
may
be
required.
However, as
vitamin
D requires activa-
tion
by
the
kidneys,
a
sub-optimal
kidney function may lead to inadequate
activation;
in
that case, the
"activated
form" of vitamin D (calcitriol) may
be
required. As
calcium deficiency
would
lead directly to a low blood
calcium
level,
a
secondary over-secretion
of
the
parathyroid hormone is
prompted.This
hormone
secretion
aims
to
induce
a
calcium outflow from the bones so
as
to
maintain adequate blood
calcium
levels.
Unfortunately, too much
of
the
hormone
may also induce an overload
of calcium
in
the tissues
-
the
phenom-
enon of "calcium paradox". Such para-
doxical calcium overload may
even
worsen
hypertension,
arteriosclerosis,
and degenerative
joint
diseases.
Similarly, adequate
calcium
intake
would paradoxically prevent
kidney
stones
-
ample dietary calcium com-
bines
with
oxalic
acid
inside
the
gut
to
form an insoluble calcium oxalate
-
etfectively preventing absorption
of
the
soluble oxalic acid
that
may form
calcium oxalate stones in
the
kidney
instead. For
optimum
calcium
supplements, consult your doctor.
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