As winter comes so do the short days and long cold nights. Along with these short sunlight days comes an apparent relationship between reduced vitamin D levels and the incidence of influenza. I’m feeling a little controversial, but is it possible there is a link here? According to Dr John Cannell this might just be the case. If you have limited sun exposure, recurring colds and flus (compromised innate immunity) or maybe even suffer from depression through winter it’s time to have your vitamin D levels checked and supplement (with health care advice) where necessary.
Cannell JJ, et al. Epidemic influenza and vitamin D. Epidemiol Infect. 2006 Dec; 134 (6):1129-40