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Liu
Ghang-Shan
INORGANIC
SALTS:
ESSENTIAL FOR PHYSICAL
ACTIVITIES
lnorganic salts are essential for
physical activities. Calcium and
phos-
phorus are vital
for
bones, teeth
and
nerves;
0.8-1
G of
calcium is
required
daily; inadequacy causes caries, brittle
bones
and
muscle cramps. Take more
milk, soya bean or their products.
Ex-
cessive diarrhoea or urine output de-
pletes potassium;
in
really
extreme
cases, the heart
may
stop beating.
Fruit
juices can provide potassium;too much
potassium occurs
in kidney failure: fa-
tal
heart beat
irregularities
results. So-
dium maintains osmotic pressure;
ex-
cess
results in high blood pressure
-
minimize
salt
and soy source intake.
lron deficiency results
in
anaemia. Daily
requirement is higher in menstruating
women,
pregnancy
and
nursing moth-
ers (20 mg)
-
animal livers,
red
or black
beans
or
spinach are rich
in iron.
lodine
is a component of thyroid hormones;
inadequacy results
in
"endemic aoitres"
-
swollen thyroid glands of inland dwell-
ers; sea-salt usually contains
enough
iodine. Zinc and selenium
are
required
in minute quantities, the latter has can-
cer prevention properties. Some soils
lack these trace
elements
but in cities,
food
delivered
from various
sources
would balance such deficiencies.
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62
