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ASK YOUR DOCTOR: WHAT DOSE OF VITAMIN D SHOULD YOU BE TAKING?
INFORMATION ABOUT VITAMIN D
Dr.
Laura Tosi, an orthopedic surgeon at Children’s National Medical Center
in Washington, D.C. said:
“The current standard for vitamin D is not adequate,”
… and predicted it would soon be raised to perhaps 1,000 International
Units a day. Vitamin supplements are crucial, because adequate
amounts of vitamin D cannot be absorbed through
diet
and sunshine alone.”
This comment appeared at the end of an article by Jane E.
Brody
“To Avoid
‘Boomeritis,’ Exercise, Exercise, Exercise” published in the New York
Times, December 19, 2006
As
far back as 2004 the problem of an inadequate intake of Vitamin D was
already highlighted in a review by Catherine Meyer, MD
that appeared in the Journal of the American Medical Association
(JAMA
September 22/29, 2004—Vol 292, No. 12 pp 1416-1418) and
the following are quotes from that article.
“Scientists Probe Role of Vitamin D
Deficiency a Significant Problem, Experts Say”
“Interest in vitamin
D deficiency, says Robert P. Heaney
of Creighton University in Omaha,
has become “greater virtually every week,
in part because of the increasing number of publications implicating
vitamin D deficiency in so many disorders.”
“Reinhold Vieth,
PhD, a biochemist
specializing in
vitamin D research at the
University of
Toronto, Ontario, predicts that in the future, the adult recommended
daily intake of vitamin D
will exceed 1000
IU/d (>25 µg/d).”
“For now, the evidence of RCTs [randomized
controlled trials] points to a
need for at least 800 IU (20 µg) per day,
and a [calcidiol] blood level of 30 ng/mL
(75 nmol/L),” he
said.
“A concern
has been that higher intakes of
vitamin D may be toxic, but most researchers say that the current
recommendation is extremely conservative
and far from levels that might
be cause for concern. According to
Vieth, 10 times the 400 IU/d dose
provided by a multivitamin or even
more would be safe for most individuals.
“COMMENTARY:
Both Heaney and Vieth said that
based on recent research findings, they have boosted their own vitamin D
in
take to levels exceeding the current recommended
intake levels (400 IU/d) supplied by
an ordinary multivitamin. If
the Food and Nutrition Board decides
to revise current vitamin D intake guidelines, they are likely to have
a lot of company”
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