Paleologos M. Cumming RG. Lazarus R. Institution
Department of Public Health and Community Medicine, Faculty of Medicine, University of Sydney, New South Wales, Australia. Title
Cohort study of vitamin C
intake and cognitive impairment.
American Journal of Epidemiology. 148(1):45-50, 1998 Jul 1. Abstract
To test the hypothesis that vitamin C protects against cognitive impairment, the authors conducted a cohort study (n=117) in a retirement community in Sydney, Australia. Vitamin C intake was assessed at baseline (1991) with a semiquantitative food frequency questionnaire, and cognitive function was assessed 4 years later (1995). After adjustment for age, sex, smoking, education, total energy intake, and use of psychotropic medications, consumption of vitamin C supplements was associated with a lower prevalence of more severe cognitive impairment (based on scores on the Mini-Mental State Examination; adjusted odds ratio=0.39, 95% confidence interval 0.18-0.84). There were no associations between vitamin C intake and scores on tests of verbal and category fluency. This study suggests that vitamin C might protect against cognitive impairment.