Habitual consumption of fruit, folic acid and cobalamin as risk/protection factors for the incidence of dementia: Data from the "InveCe.Ab" study

Abstract

AbstractBackgroundThe role of diet as a modifiable factor that may affect the incidence of dementia is currently under investigation. The diet effect could be mediated by blood level of Folic Acid and Cobalamin, whose low levels are recognized as risk factors for dementia. The aim of this work is to evaluate the effects of habitual fruit intake, Cobalamin and Folic Acid on the cumulative incidence of dementia over a period of 4 years in elderly people free of basal dementia.MethodThe subjects were 1321 people born between 1935‐39, enrolled in 2010 by the "InveCe.Ab" study (ClinicalTrials.gov ID: NCT01345110). The cohort was re‐evaluated in 2014 and the onset of dementia was ascertained. The association between fruit consumption and metabolic parameters with dementia at baseline was analyzed with t‐test for quantitative variables and with Pearson chi‐square for qualitative variables. The risk/protection effect of habitual fruit consumption and metabolic mediators on the onset of dementia after 4 years was evaluated by multiple logistic regression.Result988 subjects were included in the analysis, The new cases of dementia between 2010 and 2014 were 50. The high habitual fruit consumption was inversely associated with dementia incidence (p = 0.007) and also directly associated with higher levels of Folic Acid (p < 0.005). Women had higher levels of Folic Acid and Cobalamin (p < 0.001) and a tendency towards higher fruit consumption (p = 0.06). The logistic model using Folic Acid, Cobalamin, and sex as covariates, shows that the usual consumption of fruit reduces the 4‐year risk of developing dementia, (OR: 0.421; 95% CI: 0.213‐ 0.831) with a significant interaction between fruit consumption and Folate (OR: 0.771; 95% CI. 0.607‐0.980). Furthermore a higher level of Cobalamin results protective versus dementia.ConclusionOur data show that in a population of 70‐75 years the cumulative incidence of dementia is significantly reduced by habitual fruit consumption independently of the plasma levels of Cobalamin. Folate could be the metabolic mediator of this protection.