Link Between Vitamin D and Dementia Risk Confirmed Researchers suggest that in older people, not getting enough vitamin D may double the risk of developing dementia and AlzheimerÛªs disease. The study was published in the online issue of Neurologyå¨, the medical journal of the American Academy of Neurology. The study looked at blood levels of vitamin D, which includes vitamin D from food, supplements and sun exposure. Dietary vitamin D is found in fatty fish such as salmon, tuna or mackerel, and milk, eggs and cheese. ÛÏWe expected to find an association between low Vitamin D levels and the risk of dementia and AlzheimerÛªs disease, but the results were surprisingÛÓwe actually found that the association was twice as strong as we anticipated,Û said study author David J. Llewellyn, PhD, of the University of Exeter Medical School in the United Kingdom. For the study, 1,658 people over the age of 65 who were dementia-free had their vitamin D blood levels tested. After an average of six years, 171 participants developed dementia and 102 had AlzheimerÛªs disease. The study found that people with low levels of vitamin D had a 53-percent increased risk of developing dementia and those who were severely deficient had a 125-percent increased risk compared to participants with normal levels of vitamin D. People with lower levels of vitamin D were nearly 70 percent more likely to develop AlzheimerÛªs disease and those who had severe deficiency were over 120 percent more likely to develop the disease. The results remained the same after researchers adjusted for other factors that could affect risk of dementia, such as education, smoking and alcohol consumption. ÛÏClinical trials are now needed to establish whether eating foods such as oily fish or taking vitamin D supplements can delay or even prevent the onset of AlzheimerÛªs disease and dementia. We need to be cautious at this early stage and our latest results do not demonstrate that low vitamin D levels cause dementia. That said, our findings are very encouraging, and even if a small number of people could benefit, this would have enormous public health implications given the devastating and costly nature of dementia,Û said Llewellyn.