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Health Panel Weighs in on Benefits of Vitamin D
December 3, 2010 (NewsCore) - Vitamin D, much-touted in recent years for its myriad health benefits, may not be as good for us as many believe, according to a report released Tuesday by the Institute of Medicine.
According to the IOM, evidence for many of the health claims related to vitamin D is “inconsistent and/or conflicting or did not demonstrate causality.”
The one contention not in dispute is that vitamin D benefits bone growth and maintenance. The panel revised its recommendations for daily intake of vitamin D, increasing it to 600 international units (IU) for children and adults. It was previously set at 200 IU for children and adults to age 50 and 400 IU for adults over 50.
Though a significant increase, the new recommendations are far less than some researchers would like. Most notably, Dr. Michael Holick, a Boston University endocrinologist who studies vitamin D, has argued that most people need between 1,000 and 2,000 IU daily to achieve enough concentration in the blood for the vitamin to be beneficial.
The panel also set a recommendation for the upper limit of vitamin D intake at 4,000 IU. There is a risk, the researchers noted, when people ingest too much vitamin D. If taken in very large doses, there is a risk of kidney and tissue damage.
Few foods are natural sources of vitamin D. The best sources are fatty fish such as salmon and tuna, but cheese, egg yolks, beef liver and mushrooms contain small amounts. Some foods, such as milk and soy milk, are fortified with vitamin D.
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