PREDIMED cognitive sub-study: Mediterranean diet plus olive oil versus low-fat advice

A randomized clinical trial nested within the PREDIMED cardiovascular study enrolled 447 adults aged 55 to 80 at high cardiovascular risk and assigned them to a Mediterranean diet supplemented with extra-virgin olive oil, a Mediterranean diet supplemented with thirty grams of mixed nuts per day, or a control low-fat dietary advice group, then followed cognitive function over approximately four years using a battery of memory, fluency, attention, and executive function tests. Adults in the Mediterranean diet plus extra-virgin olive oil group showed a mean MMSE change of positive 0.62 points over four years, compared to a mean decline of 1.22 points in the control group — an adjusted mean difference of approximately 1.84 points on the same scale. Letter fluency improved in the olive oil group while declining in the control group, and memory scores on the Rey Auditory Verbal Learning Test followed a similar pattern. The same dietary intervention that had reduced cardiovascular events in the parent PREDIMED trial appeared to slow the cognitive aging trajectory in a randomized setting, with extra-virgin olive oil as the most studied dietary supplement. The Mediterranean dietary pattern — high in extra-virgin olive oil, vegetables, legumes, whole grains, fish, and nuts, moderate in dairy and poultry, and low in red meat and ultra-processed foods — has one of the most consistent evidence bases of any dietary pattern in cardiovascular research. The PREDIMED trial, a large Spanish randomized trial, demonstrated that Mediterranean diet supplemented with extra-virgin olive oil reduced the incidence of major cardiovascular events by approximately 30 percent compared to a control low-fat diet over five years of follow-up. A cognitive sub-study neste --- Paper cited: Mediterranean Diet and Age-Related Cognitive Decline: A Randomized Clinical Trial Authors: Valls-Pedret C, Sala-Vila A, Serra-Majem M, Corella D, de la Torre R, Martínez-González MA, Martínez-Lapiscina EH, Fitó M, Arós F, Wärnberg J, Estruch R, Lapetra J, Pintó X, Ros E Journal: JAMA Internal Medicine Year: 2015 DOI: 10.1001/jamainternmed.2015.1668 --- Subscribe for one peer-reviewed paper made practical, every Tuesday and Friday. Free guide: How to Read Your Biomarker Panel at 55+ - {{LEAD_MAGNET_URL}} --- EDUCATIONAL CONTENT - NOT MEDICAL ADVICE This video is for general educational and informational purposes only. It summarizes peer-reviewed research. It does NOT constitute: - Medical advice, diagnosis, or treatment - Recommendations to start, stop, or change any medication - Dosing instructions for supplements or interventions - A substitute for consultation with a licensed physician Before applying anything discussed: - Talk to your physician, especially if you take prescription medications (statins, metformin, blood thinners, antihypertensives, GLP-1 agonists, etc.) - Discuss interactions, contraindications, and your individual risk profile - Get baseline biomarkers before changing your regimen if relevant Specific cautions: - Intermittent fasting: not appropriate for people with diabetes (especially Type 1), history of eating disorders, pregnancy, or underweight status without medical supervision. - Strength/Zone-2 training: medical clearance recommended for cardiovascular or joint conditions before initiating new training loads. - Supplements: third-party tested products preferred; verify drug interactions. AFFILIATE DISCLOSURE (FTC compliant): Some links in the description may be affiliate links. We may earn a commission at no additional cost to you. We only feature products and tools relevant to the research discussed. AI-ASSISTED PRODUCTION: Voice narration is generated via Edge TTS (Microsoft Neural Voice). Research, scriptwriting, and review are conducted by a human editor before publication. Reviewed: 2026-09-23