Plant-based foundation, EVOO as the main fat, fish and legumes, nuts; little red meat and few ultra-processed foods.
PREDIMED randomized trial (high-risk people without prior disease): a Mediterranean diet with extra virgin olive oil or nuts reduced cardiovascular events (~30%) versus a low-fat diet. Landmark study (republished after correcting the randomization; conclusions held).
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The Mediterranean diet is probably the dietary pattern with the best clinical and epidemiological support for cardiovascular prevention, prevention of type 2 diabetes, prevention of some cancers, and reduction of all-cause mortality; it is characterized by high consumption of extra virgin olive oil (EVOO) as the main added fat, abundant fruits, vegetables, legumes, nuts, and whole grains, moderate fish (especially oily fish), moderate consumption of dairy (especially fermented products such as yogurt and cheese), low consumption of red and processed meats, optional moderate consumption of red wine with meals in people who drink it, and limitation of added sugars, refined flours, and ultraprocessed foods.
The PREDIMED clinical trial, published in NEJM in 2013 and reanalyzed in 2018 with almost 7,500 participants at high cardiovascular risk in Spain, is probably the most important nutrition trial of recent decades: it showed that a Mediterranean diet supplemented with EVOO (at least 50 mL/day) or with nuts (30 g/day of a mix) significantly reduced major cardiovascular events (heart attack, stroke, cardiovascular death) by approximately 30 percent compared with a low-fat control diet over 5 years of follow-up, a clinically notable effect comparable or superior to that of many preventive pharmacological interventions.
The indication with the strongest clinical support is primary and secondary cardiovascular prevention: in addition to PREDIMED, multiple prospective observational studies in Mediterranean and non-Mediterranean cohorts consistently confirm reductions of 20-30 percent in cardiovascular events and cardiovascular mortality with greater adherence to the Mediterranean pattern; these effects are comparable or superior to those of many individual pharmacological interventions and are achievable without pharmaceutical cost or significant adverse effects.
In type 2 diabetes, several clinical trials and observational studies have documented significant reductions in incidence with the Mediterranean diet (especially the EVOO variant) in people with prediabetes or increased risk, with magnitudes comparable to those of some preventive pharmacological interventions.
In cognition, several observational studies and some clinical trials have documented favorable associations between adherence to the Mediterranean diet and a lower incidence of mild cognitive impairment, dementia, and Alzheimer's disease; the data are epidemiologically robust and consistent with the cardiovascular effects (cerebral vascular health is one of the main determinants of cognitive health).
In cancer prevention, several prospective studies have documented favorable associations with the incidence of several cancers (especially colorectal, breast, prostate) in cohorts with high Mediterranean adherence, a relationship consistent with the anti-inflammatory and antioxidant profile of the dietary pattern.
The specific components with the greatest relevance for the clinical effects are: extra virgin olive oil as the main added fat (it provides oleic acid and unique polyphenols such as hydroxytyrosol, oleuropein, and oleocanthal with documented anti-inflammatory activity); oily fish 2-3 times a week (it provides EPA and DHA omega-3s); unsalted nuts, 30 g/day (favorable fat profile, fiber, minerals, polyphenols); legumes 3-4 times a week; abundant fruits and vegetables with a variety of colors (broad polyphenol profile); whole grains instead of refined ones; moderate consumption of red wine with meals in those who already drink (starting to drink for health reasons is not recommended, since the net risk of alcohol is unfavorable according to recent evidence); limitation of red and processed meats, added sugars, and ultraprocessed foods.
Practical implementation includes: using EVOO as the main fat for cooking and dressing (at least 30-50 mL/day); incorporating oily fish 2-3 times a week; eating a handful of nuts (30 g) most days as a snack; increasing legume consumption to 3-4 times a week; basing meals on a variety of vegetables and fruits; preferring whole grains; limiting red meat to 1-2 times a week and eliminating processed cold cuts; limiting added sugars, sweets, and ultraprocessed products; for drinks, water as the main choice and, optionally, a small glass of red wine with meals (no more).
Generally very safe and well tolerated as a dietary pattern; practical considerations include: quality EVOO is essential (refined or low-quality olive oil loses a large part of its active polyphenols); in people with overweight, total amounts must be adjusted to the calorie balance (the Mediterranean diet is rich in healthy fats but also calorie-dense); people with specific allergies (nuts, fish) must adapt it; in pregnancy and breastfeeding it is perfectly appropriate; in pediatrics it is an excellent basis for healthy long-term eating habits; the current clinical stance is that the Mediterranean diet (with EVOO at its core) is probably the dietary pattern with the best balance of evidence, efficacy, and sustainability for primary cardiovascular, metabolic, and cancer prevention, and should be a standard clinical recommendation for the general adult population.
Information, not medical advice. Scientific evidence reflects the quality of the studies.