(NaturalNews) For years, researchers have suspected that low levels of vitamin D in the body might raise the odds a woman will develop breast cancer, but hard scientific proof has been lacking. Now a new study conducted by scientists at the German Cancer Research Center (Deutsches Krebsforschungszentrum, DKFZ), collaborating with researchers of the University Hospitals in Hamburg-Eppendorf, provides evidence that women with low blood levels of vitamin D clearly have a substantially increased risk of breast cancer.