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Matti Narkia

Defining Adequate Vitamin D Intake : Cross-sectional and Intervention Studies - 0 views

    Defining Adequate Vitamin D Intake : Cross-sectional and Intervention Studies
    Viljakainen, Heli Tuulikki
    University of Helsinki
    Doctoral dissertation (article-based)

    Vitamin D is required for normal bone growth and maintenance of the skeleton throughout life. In Finland, like in many other Western countries, the population suffers from inadequate or deficient vitamin D status, especially during winter, which is thought to increase the risk of osteoporosis. New strategies to prevent osteoporosis are actively being sought. The main objective of this thesis was to determine whether vitamin D is feasible in the primary prevention of osteoporosis; does it affect bone mineral accrual during the growth period? A second goal was to ascertain whether seasonal variation in calcitropic hormones affects bone remodelling, and to elucidate the vitamin D intake needed to overcome this variation in different age groups.

    In summary, vitamin D intake remains inadequate among the target groups of this thesis, as reflected by seasonal variation in calcitropic hormones and bone metabolism. Dietary intake of vitamin D should be increased to achieve at least an adequate vitamin D status (S-25-OHD>50 nmol/l) and possibly an optimal vitamin D status (S-25-OHD>80 nmol/l) throughout the year. This could be accomplished by introducing new vitamin D-fortified foods to the market."
Matti Narkia

Vitamin D Status: Measurement, Interpretation, and Clinical Application - 0 views

    Vitamin D status: measurement, interpretation, and clinical application.
    Holick MF.
    Ann Epidemiol. 2009 Feb;19(2):73-8. Epub 2008 Mar 10. Review.
    PMID: 18329892


    The only way to determine whether a person is vitamin D deficient or sufficient is to measure their circulating level of 25(OH)D. There are a variety of assays used to measure 25(OH)D. The radioimmunoassays and competitive protein binding assays for 25(OH)D are useful in detecting vitamin D deficiency and sufficiency. However, these assays are fraught with technical difficulties, especially if they are not run routinely (Fig. 4) (33). Several reference laboratories have now switched to LC-MS ,which measures both 25(OH)D2 and 25(OH)D3 quantitatively. The total 25(OH)D, i.e., 25(OH)D2 plus 25(OH)D3, is what physicians need to be aware of for their patients. A level >30 ng/mL is
Matti Narkia

Millions of Needless Deaths - Life Extension - 0 views

    A large number of new vitamin D studies have appeared in the scientific literature since I wrote my plea to the federal government. These studies don't just confirm what we knew 16 months ago-they show that optimizing vitamin D intake will save even more lives than what we projected.
    Vitamin D More Effective Than Previously Known

    For instance, a study published in June 2008 showed that men with low vitamin D levels suffer 2.42 times more heart attacks. Now look what this means in actual body counts.
Matti Narkia

Why "Vitamin D" is not a hormone, and not a synonym for 1,25-dihydroxy-vitamin D, its a... - 0 views

    Why "Vitamin D" is not a hormone, and not a synonym for 1,25-dihydroxy-vitamin D, its analogs or deltanoids.
    Vieth R.
    J Steroid Biochem Mol Biol. 2004 May;89-90(1-5):571-3.
    PMID: 15225841
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