Researchers at Tufts analyzed 19 studies and found that people with a daily intake of vitamin D of more than 500 IU had a 13% lower risk of type 2 diabetes than people with a 200 IU daily intake. When they looked at blood levels, they found those with the highest blood levels (more than 25 ng/ml) were 43% less likely to develop diabetes.
In a similar analysis of 23 studies, published in the August, 2011 issue of the British Journal of Nutrition, Australian researchers found that those with the highest blood levels of vitamin D were 50% less likely to develop type 2 diabetes than those with the lowest levels.
"Vitamin D and type 2 diabetes: a systematic review." Eur J Clin Nutr. 2011 Jul 6. doi: 10.1038/ejcn.2011.118. [Epub ahead of print] Mitri J, Muraru MD, Pittas AG. Source: Division of Endocrinology, Diabetes and Metabolism, Tufts Medical Center, Boston, MA, USA.
"Diabetes prevalence is associated with serum 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D in US middle-aged Caucasian men and women: a cross-sectional analysis within the Prostate, Lung, Colorectal and Ovarian Cancer Screening Trial." Br J Nutr. 2011 Aug;106(3):339-44. Epub 2011 May 17. Brock KE, Huang WY, Fraser DR, Ke L, Tseng M, Mason RS, Stolzenberg-Solomon RZ, Michal Freedman D, Ahn J, Peters U, McCarty C, Hollis BW, Ziegler RG, Purdue MP, Graubard BI.
Jacob Teitelbaum, M.D. is one of the world's leading integrative medical authorities on fibromyalgia and chronic fatigue. He is the lead author of eight research studies on their effective treatments, and has published numerous health & wellness books, including the bestseller on fibromyalgia From Fatigued to Fantastic! and The Fatigue and Fibromyalgia Solution. Dr. Teitelbaum is one of the most frequently quoted fibromyalgia experts in the world and appears often as a guest on news and talk shows nationwide including Good Morning America, The Dr. Oz Show, Oprah & Friends, CNN, and Fox News Health.