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Vitamin D & Diabetes.

Can vitamin D supplements lower your risk of type 2 diabetes?

The Vitamin D and Type 2 Diabetes (D2d), trial randomly assigned roughly 2,400 adults with prediabetes to take either a placebo or 4,000 IU of vitamin D a day. When the study began, 4 percent of the participants had "deficient" blood levels of vitamin D (less than 12 ng/mL), 17 percent had "inadequate" levels (12 to 19 ng/mL), and 78 percent had "adequate" levels (at least 20 ng/mL). (Nationwide percentages are similar.)

After 2 1/2 years, the vitamin D takers had no lower risk of diabetes than the placebo takers. Another recent trial also came up empty.

What to do: Don't expect extra vitamin D to protect you from type 2 diabetes. However, if your blood level is deficient or inadequate or if you've never had it tested, taking the recommended daily intake--600 IU up to age 70 and 800 IU over 70--still makes sense to protect your bones.

N. Engl. J. Med. 2019. doi:10.1056/NEJMoa1900906. J. Clin. Endocrinol. Metab. 101:1647, 2016.

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Title Annotation:Quick Studies: A snapshot of the latest research on diet, exercise, and more.; role of vitamin D supplements in diabetes
Publication:Nutrition Action Healthletter
Geographic Code:1USA
Date:Jul 1, 2019
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