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    Wednesday, December 28, 2005

    Got Milk? Does vitamin D protect against cancer? Some people think so:

    High doses of vitamin D can reduce the risk of developing some common cancers by as much as 50%, US scientists claim.

    ....Taking 1,000 international units (IU) - or 25micrograms - of the vitamin daily could lower an individual's cancer risk by 50% in colon cancer, and by 30% in breast and ovarian cancer, they said.

    ....Professor Cedric Garland, who led the review study, said: "A preponderance of evidence, from the best observational studies the medical world has to offer...has led to the conclusion that public health action is needed."

    The usual recommended dose of vitamin D is 400 to 800 IU's a day. And excess of vitamin D can be bad for you.

    The research (available only in the abstract to the general public) is not the of the strongest sort:

    A PubMed database search yielded 63 observational studies of vitamin D status in relation to cancer risk, including 30 of colon, 13 of breast, 26 of prostate, and 7 of ovarian cancer, and several that assessed the association of vitamin D receptor genotype with cancer risk.

    The majority of studies found a protective relationship between sufficient vitamin D status and lower risk of cancer.

    Whenever researchers couch their results in terms of "risk," rather than absolutes, watch out. They're usually magnifying their results. The magnification is only worse when the study is a compilation of a bunch of other studies that used risk alone.

    Professor Garland has long had an interest in Vitamin D and its relationship with cancer. He gets quoted by many a tanning salon on the subject. There's nothing wrong with having a special interest for research, or a pet theory, but sometimes it can result in a blind eye to subtle nuance. It can also lead to a tendency to exaggerate the importance of a finding. Should we really promote use of high dose vitamin D for the greater public good? We can't say that based on this study, though Dr. Garland would disagree.

    posted by Sydney on 12/28/2005 08:50:00 AM 1 comments


    Vitamin can give supplement to our body and good health condition. One example of this is Vitamin D and its relationship with cancer.

    By Anonymous herbal man, at 8:48 PM  

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