In our response to that IOM paper we wrote that:
The IOM report takes a typically conservative approach to assessing studies of potential benefits and potential risks related to vitamin D intake, as well as to the blood levels of vitamin D that qualify as “sufficient.” Such an approach often minimizes potential benefits while highlighting potential risks. This can help safeguard the nation’s health from the zeitgeist of diet crazes, but when it comes to vitamin D it seems more like a missed opportunity. (Are the New Recommendations on Vitamin D a Missed Opportunity?)
In a nutshell, this captures our thoughts on the Perspective paper as well, which focuses on the potential links between vitamin D and cancer risk.
Looking at colon cancer alone, there is good evidence that people with higher circulating vitamin D levels can have as little as half the risk of developing colon cancer as those with lower vitamin D levels (International Agency for Research on Cancer 2008).
For a supplement that has a lot of potential benefit and little risk at levels that could bring this benefit, do we really need to wait 5 or more years until more definitive data might be available?
Related CNiC Posts
Are the New Recommendations on Vitamin D a Missed Opportunity?
International Agency for Research on Cancer (2008). Vitamin D and Cancer. Lyon, International Agency for Research on Cancer.