Researchers reviewed data collected during the PREDIMED study in which more than 3500 patients aged 55 to 80 years with high cardiovascular risk were randomly assigned to eat 1 of 3 diets: Mediterranean Diet supplemented with extra-virgin olive oil, Mediterranean Diet supplemented with nuts, or a control diet (patients received advice on a low-fat diet). None of the diets were calorie restricted. Over the course of the study 16% of the participants on a Med Diet enriched with extra-virgin olive oil and 18.7% of those on the Med Diet plus nuts developed type 2 diabetes, compared to 23.6% of the participants on the control diet, leading researchers to conclude that a Mediterranean Diet enriched with olive oil but without calorie restrictions can reduce diabetes risk for people with high cardiovascular risk.
Annals of Internal Medicine. 2014; 160(1):10-10-10. [Salas-Salvadó, et al].