Vitamin D for heart health

Our hometown newspaper, The New York Times, carried an article
on 11/16/2009 entitled “Vitamin D Shows Heart Benefits in Study.” The piece will not come as any terrific surprise to readers of this blog, since we’ve already cited under “Vitamin D” a recent article in the American Journal of Cardiology that suggested supplementing with Vitamin D as an important and economical option for preventing cardiovascular disease.

Quite a few NYT readers sent in comments on the article, mentioning a variety of other recent findings about the “sunshine Vitamin” (many of which we’ve already cited on this blog). We do know that a federal panel is reviewing recommendations on daily intake of Vitamin D, and is expected to issue new guidelines in the next year or so. But we hadn’t heard, as one NYT reader pointed out, that, as of recent years, the general practice in Canada is to recommend up to 2000IU of Vitamin D3/day for children to support and promote good health. Here’s an extract from the Canadian Paediatric Society’s 2007 position statement on Vitamin D supplementation (yes, all of those numbers in parenthese refer to scientific journal articles):

The emphasis is no longer solely on preventing rickets,
which requires only a relatively small amount of vitamin D
supplementation. The focus is now also on the prevention
of associated childhood and adult diseases. New findings
suggest that adequate vitamin D status in mothers during
pregnancy and in their infants may have lifetime implications.
These findings modify our knowledge and understanding of
vitamin D metabolism, our basis for diagnosis of vitamin D
deficiency and our recommendations for supplementation.

It is now clear that vitamin D is involved in the regulation
of cell growth, immunity and cell metabolism. Vitamin D
receptors are found in most tissues and cells in the body (7).
The interaction of 1,25(OH)2D with these receptors may
result in a variety of biological responses influencing disease
processes (8). Vitamin D deficiency has been linked to
osteoporosis (9); asthma (10); autoimmune diseases such as
rheumatoid arthritis, multiple sclerosis (11) and inflammatory
bowel diseases (12); diabetes (13); disturbed muscle function
(14); resistance to tuberculosis (15); and the pathogenesis of
specific types of cancer (16,17) (evidence level III).

Maternal vitamin D status during gestation and lactation
may influence the health status of the child later in life.
Bone density in nine-year-old children (evidence level II-3)
(9), the severity of asthma in three-year-old children (10)
(evidence level II-2) and the susceptibility to type 1 diabetes
(11) (evidence level II-2) have been linked to low
vitamin D status during fetal life. Intervention trials have
demonstrated that supplementation with vitamin D or its
metabolites may improve blood glucose levels in diabetics
and decrease symptoms of rheumatoid arthritis and multiple
sclerosis (11,13) (evidence level III).

Read the full text at:

http://www.cps.ca/ENGLISH/statements/II/VitaminD.pdf

See also the NYBC entries:

Vitamin D3 2500IU

Vitamin D3 1000IU

Vitamin D3 400IU

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