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'Vitamin D has a significant effect many tissues and cells and controls an enormous number of genes, including some associated with cancers, autoimmune disease, and infection. However, it also has an incredible effect on our mood and cognition, especially in the winter months when we need it most.
For the past several years, there has been considerable interest in the role vitamin D plays in improving health and preventing disease. Significant negative associations are found between vitamin D levels and disease severity. Hardly a month goes by without news about the risks of vitamin D deficiency or about a potential role for the vitamin in warding off diseases, including breast cancer, multiple sclerosis, and even schizophrenia.'