HEALTH AWARENESS WELFARE (HAW)
PARIS: Vitamin D supplements have no significant effect on preventing heart
attack, stroke, cancer or bone fractures, according to a review of
scientific evidence published Friday.
Researchers led by Mark
Bolland of the University of Auckland in New Zealand looked at 40
high-quality trials to see if supplements met a benchmark of reducing
risk of these problems by 15 percent or more.
Previous research had seen a strong link between vitamin D deficiency and poor health in these areas.
But
the new study, published in The Lancet Diabetes & Endocrinology,
strengthens arguments that vitamin D deficiency is usually the result of
ill health -- not the cause of it.
Its authors say there is
"little justification" for doctors to prescribe vitamin D supplements as
a preventive measure for these disorders.
"Available evidence
does not lend support to vitamin D supplementation and it is very
unlikely that the results of a future single randomised clinical trial
will materially alter the results from current meta-analyses," they
write.
Vitamin D is a key component for healthy bones, teeth and muscles.
It is produced naturally when the skin is exposed to sunlight or derived from foods such as oily fish, egg yolks and cheese.
In
March last year, British scientists, in a comparison of 4,000 women,
found that vitamin D supplements taken in pregnancy made no difference
to the child's bone health.
And in September 2012, researchers at
New York's Rockefeller University saw no evidence that vitamin D
supplements lowered cholesterol, a factor in heart disease, at least
over the short term.
In contrast, a November 2012 investigation
into pregnant women who lived in high-latitude, northern hemisphere
countries with long, dark winters found a link between low levels of
natural vitamin D and an increased risk of multiple sclerosis (MS) in
their offspring.
For these women, taking vitamin D supplements to
offset the effects of long periods without sunlight could be advisable,
according to that research.most
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