Studies show that 15 percent of the global population living above 40?? north and below 40?? south of the equator, where sun exposure is reduced, are more prone to autoimmune diseases, such as inflammatory bowel disease, MS, type 1 diabetes and rheumatoid arthritis. [caption id=attachment_16188 align=alignleft width=133] Antonio Antico, MD[/caption]However, the authors of the new review say