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Vitamin D recommendations were miscalculated, study suggests

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Fish such as herring (pictured) mackeral and tuna are good sources of vitamin D. (Jacek Chabraszewski/Shutterstock.com)

We need far more vitamin D than previously thought, according to two teams of researchers from Canada and the US.

The Recommended Dietary Allowance (RDA) for vitamin D is ten times lower than what we actually need, say two teams of researchers who have challenged the US’s National Academy of Sciences (NAS) and the Institute of Medicine (IOM), both responsible for the RDA.

“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,” says Dr. Cederic Garland, an adjunct professor at University of California, San Diego.

Currently the RDA for vitamin D established by the IOM is 600 international units per day until we reach 70 years of age, and 800 IU per day thereafter.

A Canadian research team reviewed each of the 10 studies the IOM used to arrive at their RDA and their calculations revealed that 600 IU of vitamin D per day puts only half of the amount that they had assumed in […]