Vitamin D Deficiency and Depression: A Short Review Article

Depression is a common illness worldwide and results from a complex interaction between social, psychological, and biological factors. Although there are studies reporting a correlation between vitamin D deficiency and mood disorders, a consensus on a concrete link between vitamin D levels and depression has yet to be reached. In this short review, we discuss the relationship between vitamin D deficiency and depression. Our literature review yielded 42 articles published since 2006 in the electronic databases of MEDLINE, EMBASE, CINAHL, AMED, and PsycINFO. This study was conducted on the assumption that low levels of vitamin D are associated with depression. However, for all the evidence indicative of an association between low levels of vitamin D and depression, there is still a great deal of controversy over such correlation due to the current conflicting results. Further research is needed to fully elucidate the issue. The initial assumption of a relationship between vitamin D and high prevalence of seasonal affective disorder in winter was based on the high prevalence of depression on high latitudes. Although some studies have shown an association between depression and vitamin D deficiency, it still cannot be indisputably concluded that augmenting the levels of vitamin D alone alleviate depression.