A new Swedish study on vitamin E and its role in helping prevent Alzheimer’s has shown that high levels of several vitamin E components in the blood are associated with a decreased risk for Alzheimer's in advanced age, suggesting that vitamin E may help prevent cognitive deterioration in elderly people. "Vitamin E is a family of eight natural components, but most studies related to Alzheimer’s disease investigate only one of these components, ±-tocopherol," says Dr. Francesca Mangialasche, who led the study. "We hypothesized that all the vitamin E family members could be important in protecting against AD. If confirmed, this result has implications for both individuals and society, as 70 percent of all dementia cases in the general population occur in people over 75 years of age, and the study suggests a protective effect of vitamin E against AD in individuals aged 80+."
The study, published in the July 2010 issue of the Journal of Alzheimer’s Disease was conducted at the Aging Research Center of the Karolinska Institutet in Stockholm, Sweden, in collaboration with the Institute of Gerontology and Geriatrics at the University of Perugia in Italy. It included 232 participants from the Kungsholmen Project, a population-based longitudinal study on aging and dementia in Stockholm. All were 80+ years and were dementia-free at the beginning of the study. After 6-years of follow-up, 57 AD cases were identified. The blood levels of all eight natural vitamin E components were measured in participants at the beginning of the study. Subjects with higher blood levels were compared with subjects who had lower blood levels to verify whether these two groups developed dementia at different rates.
The study found that subjects with higher blood levels of all the vitamin E family forms had a reduced risk of developing AD, compared to subjects with lower levels. After adjusting for various confounders, the risk was reduced by 45 to 54%, depending on the vitamin E component. Dr. Mangialasche notes that the protective effect of vitamin E seems to be related to the combination of the different forms. Another recent study indicated that supplements containing high doses of the E vitamin form ±-tocopherol may actually increase mortality, emphasizing that such dietary supplements, if not used in a balanced way, may be more harmful than previously thought. "Elderly people as a group are large consumers of vitamin E supplements, which usually contain only ±-tocopherol, and this often at high doses", says Dr Mangialasche. "Our findings need to be confirmed by other studies, but they open up for the possibility that the balanced presence of different vitamin E forms can have an important neuroprotective effect."
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