I happened to see something in that New York Times article about the vitamin D study. The article…
Study Finds Another Condition That Vitamin D Pills Do Not Help, New York Times, 27 July 2022
Dr. Rosen said those concerns led him and the other members of the National Academy of Medicine’s expert group to set* what he called an “arbitrary value” of 20 nanograms per milliliter of blood as the goal for vitamin D levels and to advise people to get 600 to 800 international units of vitamin D supplements to achieve that goal.
*Here’s that report:
The 2011 Report On Dietary Reference Intakes For Calcium And Vitamin D From The Institute Of Medicine: What Clinicians Need To Know, The Journal of Clinical Endocrinology and Metabolism, January 2011
Which also says…
The Committee finds that the prevalence of vitamin D inadequacy in the North American population has been overestimated by some groups due to the use of inappropriate cut-points that greatly exceed the levels identified in this report.
Back to the NYTs article:
Labs in the United States then arbitrarily set 30 nanograms per milliliter as the cutoff point for normal vitamin D levels, a reading so high that almost everyone in the population would be considered vitamin D deficient.
All this “arbitrary.”
There are real problems with taking too much vitamin D, as I’ve posted about:
- High Dose Vitamin D Increases Risk For Fractures And Falls, “Two recent randomized controlled trials (RCTs) both using annual high-dose vitamin D reported an increase, rather than a decrease, in the primary outcome of fractures.”
- High-Dose Vitamin D Decreases Bone Mineral Density
The problems don’t end with bone. Vitamin D is a hormone after all, with far-reaching effects. I used to trust people in the health heirarchy.