A systematic review of PubMed, Embase, and Cochrane records through January 2026 found only three eligible studies (two randomized trials, one observational; 282 women in total) testing Mediterranean diet adherence against body weight in postmenopausal women. Results were mixed. The diet showed no consistent advantage over comparators for body weight, fat mass, or lean mass, and the authors concluded that MedDiet counseling without explicit energy restriction should not be assumed to produce clinically meaningful weight or fat loss.
The headline is less a verdict against the diet than a verdict on how thin the evidence is. Three small, dissimilar studies cannot be pooled, and the review offers only a qualitative synthesis. That fits the wider literature: PREDIMED-Plus showed that a Mediterranean pattern combined with calorie restriction and physical activity reduces weight and visceral fat, while ad libitum MedDiet advice typically yields modest or null weight change. Weight was also never the diet's strongest claim. Its best-supported benefits, including fewer cardiovascular events and lower mortality, appear to operate independently of scale weight. For postmenopausal women, who tend to gain abdominal fat and lose lean mass as estrogen falls, the practical reading is to treat the MedDiet as a sound dietary foundation but pair it with a deliberate energy deficit and resistance training if fat loss is the goal. Limitations are severe: tiny samples, short follow-up, heterogeneous protocols, and no body-composition standardization. This is confirmatory of existing nuance rather than paradigm-shifting, and it mainly exposes a research gap.