The Mediterranean Diet at 30: Why Its Pyramid Still Stands as a Longevity Blueprint

Thirty years after Willett and colleagues introduced the Mediterranean diet pyramid in 1995, this narrative review by Visioli, Martínez-Urbistondo and Martínez-González asks whether the diet's benefits extend beyond cardiovascular disease, type 2 diabetes, cancer and cognitive decline. Research interest has surged. A PubMed search on March 26, 2025 found 15,667 publications on the Mediterranean diet, compared with 2,205 for the DASH diet, 206 for the Nordic diet and just 32 for the Atlantic diet.

The established evidence is anchored in large randomized trials. In PREDIMED, a Mediterranean diet supplemented with extra virgin olive oil cut major cardiovascular events by 31%, and one supplemented with nuts cut them by 28%, versus advice to follow a low-fat diet. In secondary prevention, CORDIOPREV found a 26% lower risk of recurrent cardiovascular events in patients with coronary heart disease. The authors argue the combined effect of the whole pattern likely exceeds the sum of its parts.

For liver health, the review focuses on metabolic dysfunction-associated steatotic liver disease (MASLD), the most common chronic liver condition worldwide. Observational studies link the diet with less liver fat, better liver enzymes and slower fibrosis progression. A meta-analysis of randomized trials, despite heterogeneity, concluded the diet can reduce MASLD severity, and several later systematic reviews agreed. Evidence for protection against hepatocellular carcinoma is suggestive but imprecise. Alcohol remains contentious, which is why the UNATI trial, testing alcohol cessation versus moderation within a Mediterranean pattern, and its UNATI-CUN sub-study were launched.

Kidney evidence is mixed. Chronic kidney disease affects an estimated 850 million people, and guidelines support the diet at any stage. In the DIRECT trial (n = 318), energy-reduced Mediterranean, low-fat and low-carbohydrate diets produced similar benefits at two years. CORDIOPREV showed better preservation of kidney function in heart attack survivors. PREDIMED, however, found no added protection against diabetic nephropathy over 6 years compared with a low-fat diet, possibly because weight loss was similar in both groups. Cohort data suggest slower CKD progression and less albuminuria.

For mental health, a systematic review found the strongest evidence for the Mediterranean diet and incident depression, with a combined relative risk of 0.67 (95% CI 0.55–0.82) for highest versus lowest adherence across four longitudinal studies. Plausible mechanisms involve inflammatory mediators such as C-reactive protein, interleukin-6 and tumor necrosis factor-alpha. Long-term trials are scarce, though. PREDIMED results were essentially null, with marginal significance in the nut group, while the PREDI-DEP secondary prevention trial showed improvements in the mental health dimensions of quality of life.

Mechanistically, the authors point to olive oil polyphenols, fiber, potassium, magnesium, a low glycemic index and effects on the gut microbiota. Because olive oil has only modest effects on cholesterol, they stress choosing high-quality, phenol-rich extra virgin oil. Wine drunk moderately with meals may differ from binge drinking. The authors conclude that broader benefits remain largely unexplored. Future work must address climate effects on olive oil and produce, and the higher cost of healthy diets.