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Vitamin D Cuts the Risk of Type 2 Diabetes

Back-to-back...here's a second study on vitamin D in as many days. This is a nice study on vitamin D's ability to reduce the risk of diabetes. You may not think this is anything new, and you're right. This study was a meta-analysis which pools the results of previous studies on this topic together to develop an overall picture (19 previous studies on this subject were included in this analysis).

According to data published, intakes greater than 500 IU/day reduced the risk of Type 2 Diabetes by 13%. When grouping people according to levels of vitamin D in the blood (as 25-hydroxyvitamin D, the inactive "storage" form), those who had more than 25 ng/mL, had a 43% lower risk of Type 2 Diabetes than people with the lowest blood levels (less than 14 ng/mL).

To convert ng/mL (conventional US
units) to nmol/L (the international
standard), multiply by a factor of 2.5
Keep in mind that according to vitamin D researchers/experts, even 25 ng/mL is considered low, with many now considering 30 ng/mL the low end of "normal." What does that translate to in terms of IU/day from a supplement? Well, it differs between individuals based on many factors, but you're likely looking in the range of at least 2000 IU/day. It's thought that 5000 IU/day will result in blood levels of 50-70 ng/mL (125-175 nmol/L), which seems to be optimal according to the latest research.

Source: Vitamin D and type 2 diabetes: a systematic review

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