Monday, March 23, 2015
Researchers from UC San Diego and Creighton University have challenged the vitamin D recommendations proposed by the National Academy of Sciences (NAS) Institute of Medicine (IOM). They found that the Recommended Dietary Allowance (RDA) for vitamin D is underestimated by a factor of 10.
The researchers, in their letter published in the journal Nutrients, confirmed this calculation error supported by 2 other studies by different authors. The vitamin D intake specified by IOM is 600 IU/day until 70 years of age and 800 IU/day for older ages.
The researchers found that these doses are only about one-tenth of those required to bring down the incidence of diseases related to vitamin D deficiency. To address this deficit, the researchers suggest a RDA of approximately 7,000 IU/day from all sources. They found that this figure is below the 10,000 IU/day upper level intake for teens and adults specified by IOM.
Talking about their findings, the researchers said, “The error has broad implications for public health regarding disease prevention and achieving the stated goal of ensuring that the whole population has enough vitamin D to maintain bone health."
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