VITAMIN D UPDATE: Low Vitamin D Level Tied to Type 1 Diabetes. “Researchers examined frozen blood samples taken between 2002 and 2008 from 1,000 active-duty military personnel, who all later developed Type 1 diabetes. They matched each with a sample from a healthy person of the same age and sex drawn within two days of the same date, and then tracked cases through 2011. The results appear in the December issue of the journal Diabetologia. Compared with those who had vitamin D levels above 40 nanograms per milliliter of blood, those with readings of 17 nanograms or less were more than three times as likely to develop Type 1 diabetes, the researchers found. Military personnel with readings between 17 and 23 nanograms were more than twice as likely to develop the disease.”