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Mediterranean diet improves cognition: the PREDIMED-NAVARRA randomised trial
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Mediterranean diet improves cognition: the PREDIMED-NAVARRA randomised trial
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Journal Article
Mediterranean diet improves cognition: the PREDIMED-NAVARRA randomised trial
2013
Overview
Objective Previous observational studies reported beneficial effects of the Mediterranean diet (MedDiet) on cognitive function, but results were inconsistent. We assessed the effect on cognition of a nutritional intervention using MedDiets in comparison with a low-fat control diet. Methods We assessed 522 participants at high vascular risk (44.6% men, age 74.6 ± 5.7 years at cognitive evaluation) enrolled in a multicentre, randomised, primary prevention trial (PREDIMED), after a nutritional intervention comparing two MedDiets (supplemented with either extra-virgin olive oil (EVOO) or mixed nuts) versus a low-fat control diet. Global cognitive performance was examined by Mini-Mental State Examination (MMSE) and Clock Drawing Test (CDT) after 6.5 years of nutritional intervention. Researchers who assessed the outcome were blinded to group assignment. We used general linear models to control for potential confounding. Results After adjustment for sex, age, education, Apolipoprotein E genotype, family history of cognitive impairment/dementia, smoking, physical activity, body mass index, hypertension, dyslipidaemia, diabetes, alcohol and total energy intake, participants allocated to the MedDiet+EVOO showed higher mean MMSE and CDT scores with significant differences versus control (adjusted differences: +0.62 95% CI +0.18 to +1.05, p=0.005 for MMSE, and +0.51 95% CI +0.20 to +0.82, p=0.001 for CDT). The adjusted means of MMSE and CDT scores were also higher for participants allocated to the MedDiet+Nuts versus control (adjusted differences: +0.57 (95% CI +0.11 to +1.03), p=0.015 for MMSE and +0.33 (95% CI +0.003 to +0.67), p=0.048 for CDT). These results did not differ after controlling for incident depression. Conclusions An intervention with MedDiets enhanced with either EVOO or nuts appears to improve cognition compared with a low-fat diet. ISRCTN:35739639
Publisher
BMJ Publishing Group Ltd,BMJ Publishing Group LTD
Subject
/ Cardiovascular Diseases - diet therapy
/ Cardiovascular Diseases - prevention & control
/ Cognitive Dysfunction - diet therapy
/ Cognitive Dysfunction - epidemiology
/ Dementia
/ Diet
/ Diet, Fat-Restricted - psychology
/ Diet, Mediterranean - psychology
/ Female
/ Humans
/ Male
/ Nuts
/ Olea
/ Plant Oils - therapeutic use
