Low Vitamin D Linked to Insulin Resistance
 (NY, Reuters Health, 6/29/04)

When Dr. Ken C. Chiu of the University of California, Los Angeles, and team, administered oral glucose tests to 126 volunteers who had no obvious symptoms of glucose intolerance, the investigators found that blood glucose levels declined more slowly in subjects with low vitamin D levels. In addition, participants with low concentrations of D were likelier to exhibit signs of metabolic syndrome, including obesity, hypertension and insulin resistance, than their peers. These findings suggest that a low blood level of vitamin D may be associated with substandard blood glucose metabolism, even when blood sugar levels appear normal.

(American Journal of Clinical Nutrition, May 2004)