This article barely touches on the meat of the subject. Vitamin D levels can be measured. There are a broad range of ways to increase Vitamin D levels. Becau

This article barely touches on the meat of the subject. Vitamin D levels can be measured. There are a broad range of ways to increase Vitamin D levels. Because Vitamin D is involved in so much physiology making sure to get enough sleep and avoid or handle stress tends to increase Vitamin D levels. Vitamin D is present in eggs, oily fish, and organ meats. The most recommended way to increase Vitamin D levels most of the year is to get some sun exposure at mid day. Vitamin D pills are not necessarily part of an active approach to raising Vitamin D levels. Also, much as "Sugar: The Bitter Truth" has changed our understanding of sugar by presenting detailed analysis of the biology so there is also a great deal of specific research about exactly what Vitamin D does and what happens when one becomes deficient. All of this is much more robust than the studies of populations claiming to take pills just as the studies of diet consistently had a range of problems that detailed understanding of the biology did not have.