VITAMIN D UPDATE: Study: Vitamin D Supplements May Protect Against Colds. “Supplementing the diets of kids with low vitamin D levels is strongly associated with a decreased incidence of acute respiratory tract infections (colds). . . . The authors point out that while the study was conducted internationally in a unique environment, the children in this study could be considered analogous to other at-risk populations. A 2009 study in the Archive of Internal Medicine reported that nearly 3 out of 4 adolescents and adults in the United Staes have insufficient vitamin D levels. African American children living in northern states have the highest rates of deficiency. Breast-fed infants and the elderly also tend to suffer from vitamin D deficiencies.”