timmer: ideas

Scientists measured blood levels of the vitamin in a representative sample of 1,766 people over 65 and assessed their mental functioning with a widely used questionnaire. About 12 percent were cognitively impaired, and the lower their vitamin D level, the more likely they were to be in that group. Compared with those in the highest one-quarter for serum vitamin D, those in the lowest were 2.3 times as likely to be impaired, even after statistically adjusting for age, sex, education and ethnicity. Men showed the effect more strongly than women. “The cause of dementia is not vitamin D deficiency,” said David Llewellyn, a research associate at Cambridge University and the study’s lead author. “It’s a very complicated disease. But while further research is needed, vitamin D supplementation is cheap, safe and convenient, and may therefore play an important role in prevention.