More Vitamin D
2007-06-30 19:01:20The quotation towards the end of the following article grabed me, "We need to
discard the notion that vitamin D affects a disease
state in a simple way." But because everybody desires simple answers, this is
what is sold by some. Others, for whom simplicity is an uncomortable place,
peddle discord. Examples include Vitamin C, Vitamin E; first they cure, then
they don't, then they're harmful in some previously unaccountable manner.
Yadda, Yadda, Yadda. Its not science, its a sitcom, and a bad one at that.
And the journal headline reference below...."Vitamin D discovery outpaces FDA
decision making," not exactly a man-bites-dog headline is it?
Jeff
"The reason why some people get lost in their thoughts is that it can be such
unfamiliar territory for them."
Vitamin D Deficiency Study Raises New Questions About Disease And Supplements
Science News Daily (Jan. 27, 2008)
Low blood levels of vitamin D have long been associated with disease,
and the assumption has been that vitamin D supplements may protect
against disease. However, this new research demonstrates that ingested
vitamin D is immunosuppressive and that low blood levels of vitamin D
may be actually a result of the disease process. Supplementation may
make the disease worse.
In a new report Trevor Marshall, Ph.D., professor at Australias
Murdoch University School of Biological Medicine and Biotechnology,
explains how increased vitamin D intake affects much more than just
nutrition or bone health. The paper explains how the Vitamin D Nuclear
Receptor (VDR) acts in the repression or transcription of hundreds of
genes, including genes associated with diseases ranging from cancers to
multiple sclerosis.
"The VDR is at the heart of innate immunity, being responsible for
expression of most of the antimicrobial peptides, which are the bodys
ultimate response to infection," Marshall said.
"Molecular biology is now forcing us to re-think the idea that a low
measured value of vitamin D means we simply must add more to our diet.
Supplemental vitamin D has been used for decades, and yet the epidemics
of chronic disease, such as heart disease and obesity, are just getting
worse."
"Our disease model has shown us why low levels of vitamin D are
observed in association with major and chronic illness," Marshall
added. "Vitamin D is a secosteroid hormone, and the body regulates the
production of all it needs. In fact, the use of supplements can be
harmful, because they suppress the immune system so that the body
cannot fight disease and infection effectively."
Marshall's research has demonstrated how ingested vitamin D can
actually block VDR activation, the opposite effect to that of Sunshine.
Instead of a positive effect on gene expression, Marshall reported that
his own work, as well as the work of others, shows that quite nominal
doses of ingested vitamin D can suppress the proper operation of the
immune system. It is a different metabolite, a secosteroid hormone
called 1,25-dihydroxyvitamin D, which activates the VDR to regulate the
expression of the genes. Under conditions that exist in infection or
inflammation, the body automatically regulates its production of all
the vitamin D metabolites, including 25-hydroxyvitamin D, the
metabolite which is usually measured to indicate vitamin D status.
Vitamin D deficiency, long interpreted as a cause of disease, is
more likely the result of the disease process, and increasing intake of
vitamin D often makes the disease worse. "Dysregulation of vitamin D
has been observed in many chronic diseases, including many thought to
be autoimmune," said J.C. Waterhouse, Ph.D., lead author of a book
chapter on vitamin D and chronic disease.
"We have found that vitamin D supplementation, even at levels many
consider desirable, interferes with recovery in these patients."
"We need to discard the notion that vitamin D affects a disease
state in a simple way," Marshall said. "Vitamin D affects the
expression of over 1,000 genes, so we should not expect a simplistic
cause and effect between vitamin D supplementation and disease. The
comprehensive studies are just not showing that supplementary vitamin D
makes people healthier."
Journal reference: Marshall TG. Vitamin D discovery outpaces FDA
decision making. Bioessays. 2008 Jan 15;30(2):173-182 [Epub ahead of
print] Online ISSN: 1521-1878 Print ISSN: 0265-9247 PMID: 18200565
Adapted from materials provided by Autoimmunity Research Foundation, via
AlphaGalileo.