Later On

A blog written for those whose interests more or less match mine.

African-Americans need more vitamin D

with one comment

From Science News:

The sunshine vitamin offers a broad range of benefits—from boosting bone and muscle strength to offering protection against cancer and diabetes. Unfortunately, the diet is a poor source of vitamin D, and dark skin filters out much of the sun’s vitamin-producing ultraviolet light. To achieve healthy concentrations of vitamin D, therefore, many African-American women may need hefty daily supplements, a new study finds.

Researchers at the Winthrop University Hospital in Mineola, N.Y., recruited 208 postmenopausal black women for a 3-year trial during which half received large daily doses of vitamin D.

Increasingly, nutrition scientists advocate at least 75 nanomoles of vitamin D per liter of blood as a minimum target value for health, notes John F. Aloia, an endocrinologist and coauthor of the study.

Even after 2 years of supplementation with 800 international units of vitamin D daily—twice the recommended daily intake—treated women attained only 88 percent of the target value for this vitamin in their blood, Aloia’s group reports in the December American Journal of Clinical Nutrition. The supplemented women reached the target value only after their intake was bumped up to 2,000 IU per day in the third year of the trial.

Written by Leisureguy

31 December 2007 at 10:58 am

Posted in Daily life, Health, Science

One Response

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  1. Those readers who like to understand the full details of this research may like to know the full text is online free from http://www.nutrition.org/journal/december/PR_ajcn1.pdf
    Bear in mind also that Hollis has shown in his paper “Circulating Vitamin D3 and 25-hydroxyvitamin D in Humans” that in fact the body likes to stabilise its 25(OH)D over 100nmol/l and the best level to aim for is around 150nmol/l or 60ng/ml as this maximises the store of D3 in you tissues.
    137.5nmol/l 55ng/ml appears to be the level associated with least cancer incidence. So if 2000iu will get status raised to 75nmol/l double that will be needed to achieve 137.5nmol/l.

    Like

    Edward Hutchinson

    31 December 2007 at 1:35 pm


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