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Mayo Clinic still wants stronger evidence of benefits of vitamin D – Jan 2011

Vitamin d insufficiency.

Mayo Clin Proc. 2011 Jan;86(1):50-60.
Thacher TD, Clarke BL.
Department of Family Medicine, Mayo Clinic, 200 First St SW, Rochester, MN 55905. thacher.thomas at mayo.edu.

Vitamin D deficiency, which classically manifests as bone disease (either rickets or osteomalacia), is characterized by impaired bone mineralization. More recently, the term vitamin D insufficiency has been used to describe low levels of serum 25-hydroxyvitamin D that may be associated with other disease outcomes.
Reliance on a single cutoff value to define vitamin D deficiency or insufficiency is problematic because of the wide individual variability of the functional effects of vitamin D and interaction with calcium intakes.

In adults, vitamin D supplementation reduces the risk of fractures and falls.

The evidence for other purported beneficial effects of vitamin D is primarily based on observational studies.

We selected studies with the strongest level of evidence for clinical decision making related to vitamin D and health outcomes from our personal libraries of the vitamin D literature and from a search of the PubMed database using the term vitamin D in combination with the following terms related to the potential nonskeletal benefits of vitamin D:

mortality, cardiovascular, diabetes mellitus, cancer, multiple sclerosis, allergy, asthma, infection, depression, psychiatric, and pain.

Conclusive demonstration of these benefits awaits the outcome of controlled clinical trials. PMID: 21193656
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