NEW YORK (Reuters) - In people with low blood levels of vitamin D, boosting them with supplements more than halved a persons risk of dying from any cause compared to someone who remained deficient, in a large new study. Analyzing data on more than 10,000 patients, University of Kansas researchers found that 70 percent were deficient in vitamin D and they were at significantly higher risk for a variety of heart diseases. D-deficiency also nearly doubled a persons likelihood of dying, whereas correcting the deficiency with supplements lowered their risk of death by 60 percent. We expected to see that there was a relationship between heart disease and vitamin D deficiency; we were surprised at how strong it was, Dr. James L. Vacek, a professor of cardiology at the University of Kansas Hospital and Medical Center, told Reuters Health. It was so much more profound than we expected.