Understanding vitamin D deficiency

Vitamin D deficiency is a global health problem caused mainly by insufficient exposure to sunlight, and it is estimated that 1 billion people have vitamin D deficiency or insufficiency worldwide. It is particularly prevalent among elderly people.
This recent open access article in the Age and Aging journal, gives key information facts and discusses the impact of this major health problem.

Sahota, O. (2014). Understanding vitamin D deficiency. Age and Aging, 43 (5): 589-591.