Seniors with low vitamin D intake have twice the odds of developing Alzheimer’s disease compared to seniors with optimal vitamin D levels. In a study from the University of Exeter Medical School in the U.K., 1,658 seniors free from dementia, heart disease, and stroke were tested for vitamin D status and their mental status was assessed roughly six years later. During the subsequent years, 171 seniors in the group developed all-cause dementia, including 102 cases of Alzheimer’s. Results showed that the risk for Alzheimer’s and other forms of dementia increased with the severity of vitamin D deficiency. Those with the lowest vitamin D levels at the study’s start had a 2.25-fold increased risk for dementia and a 2.2-fold increased risk for Alzheimer’s compared to seniors who were optimally nourished in the vitamin. Dementia risk markedly increased with blood vitamin D levels below 50nmol/L.
Littlejohns T, Henley W, Lang I, et al: Vitamin D and the risk of dementia and Alzheimer disease. Neurology 2014;August 6th.