January 3rd, 2012 

National Health and Nutrition Examination Survey

written by Michael O’Leary

People with type 2 diabetes who control their blood glucose with metformin are more likely to be deficient in vitamin B12 than those who don’t use metformin.

That’s the finding of a survey of more than 8,000 adults, 6,867 of whom have type 2 diabetes conducted by the National Health and Nutrition Examination Survey. The survey results appear online Dec. 16 in the journalDiabetes Care.

The survey involved U.S. adults 50 years or older, and included 1,621 people without diabetes and 6,867 people with type 2 diabetes. Participants had to have been diagnosed with type 2 diabetes after age 30 and had not started insulin therapy within a year of being diagnosed. Vitamin B12 deficiency was defined as concentrations of the vitamin in the blood below 148 pmol/L, and borderline deficiency was between 148 and 221 pmol/L. (Published site)