The results of a new study conducted by researchers in France suggest that selenium levels decrease with age, which may contribute to a loss of neurological abilities in the elderly.
Because "oxidative stress" is one cause of brain impairment, "selenium, which is an antioxidant, may protect against cognitive decline," Dr. N. Tasnime Akbaraly, of Universite Montpellier, and colleagues report in the journal Epidemiology.
Cognitive function refers to how the brain processes information, and includes functions such as comprehension, decision-making, memory and learning, abilities that may be lost in dementia.
The researchers recruited 1,389 French subjects between 1991 and 1993 for a 9-year study with 6 follow-up periods. At study entry, the participants ranged in age from 60 to 71 years and provided information on social factors, demographic factors and underwent tests to assess cognitive function. Overall, 703 subjects completed the study.
At study entry, the average selenium levels in the blood were 1.09 micromoles per liter - and the average levels decreased by the end of the study. However, declines were not seen in all subjects. Read more...
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