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Dietary intake of menaquinone is associated with a reduced risk of coronary heart disease: the Rotterdam Study.\nGeleijnse JM, Vermeer C, Grobbee DE, Schurgers LJ, Knapen MH, van der Meer IM, Hofman A, Witteman JC.\nJ Nutr. 2004 Nov;134(11):3100-5.\nPMID: 15514282

Vitamin D and prevention of colorectal adenoma: a meta-analysis.\nWei MY, Garland CF, Gorham ED, Mohr SB, Giovannucci E.\nCancer Epidemiol Biomarkers Prev. 2008 Nov;17(11):2958-69.\nPMID: 18990737

Clinical aspects of vitamin D in the management of rheumatoid arthritis.\nLeventis P, Patel S.\nRheumatology (Oxford). 2008 Nov;47(11):1617-21. Epub 2008 Aug 5. Review.\nPMID: 18682414 \ndoi:10.1093/rheumatology/ken296 \n

EPIDEMICS' TIMING DETERMINED BY LATITUDEGoing back to 1945, Hope-Simpson discovered that influenza epidemics above 30 degrees latitude in both hemispheres occurred during the six months of least solar radiation and that outbreaks in the tropics almost always occured during the rainy season. He thus concluded, "Latitude alone broadly determines the timing of the epidemics in the annual cycle, a relationship that suggests a rather direct effect of some component of solar radiation acting positively or negatively upon the virus, the human host, or their interaction." That is, something may be regularly reducing our immunity every fall and winter. In 2003 researchers confirmed that influenza epidemics in the tropics occur, with few exceptions, during the rainy season, when vitamin D levels should be falling