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Randomized Controlled Trial
. 2011 Jan;34(1):14-9.
doi: 10.2337/dc10-1288. Epub 2010 Oct 7.

Reduction in the incidence of type 2 diabetes with the Mediterranean diet: results of the PREDIMED-Reus nutrition intervention randomized trial

Jordi Salas-Salvadó  1 , Monica Bulló, Nancy Babio, Miguel Ángel Martínez-González, Núria Ibarrola-Jurado, Josep Basora, Ramon Estruch, Maria Isabel Covas, Dolores Corella, Fernando Arós, Valentina Ruiz-Gutiérrez, Emilio Ros; PREDIMED Study Investigators
Affiliations
Randomized Controlled Trial

Reduction in the incidence of type 2 diabetes with the Mediterranean diet: results of the PREDIMED-Reus nutrition intervention randomized trial

Jordi Salas-Salvadó et al. Diabetes Care. 2011 Jan.

Erratum in

Abstract

Objective: To test the effects of two Mediterranean diet (MedDiet) interventions versus a low-fat diet on incidence of diabetes.

Research design and methods: This was a three-arm randomized trial in 418 nondiabetic subjects aged 55-80 years recruited in one center (PREDIMED-Reus, northeastern Spain) of the Prevención con Dieta Mediterránea [PREDIMED] study, a large nutrition intervention trial for primary cardiovascular prevention in individuals at high cardiovascular risk. Participants were randomly assigned to education on a low-fat diet (control group) or to one of two MedDiets, supplemented with either free virgin olive oil (1 liter/week) or nuts (30 g/day). Diets were ad libitum, and no advice on physical activity was given. The main outcome was diabetes incidence diagnosed by the 2009 American Diabetes Association criteria.

Results: After a median follow-up of 4.0 years, diabetes incidence was 10.1% (95% CI 5.1-15.1), 11.0% (5.9-16.1), and 17.9% (11.4-24.4) in the MedDiet with olive oil group, the MedDiet with nuts group, and the control group, respectively. Multivariable adjusted hazard ratios of diabetes were 0.49 (0.25-0.97) and 0.48 (0.24-0.96) in the MedDiet supplemented with olive oil and nuts groups, respectively, compared with the control group. When the two MedDiet groups were pooled and compared with the control group, diabetes incidence was reduced by 52% (27-86). In all study arms, increased adherence to the MedDiet was inversely associated with diabetes incidence. Diabetes risk reduction occurred in the absence of significant changes in body weight or physical activity.

Conclusions: MedDiets without calorie restriction seem to be effective in the prevention of diabetes in subjects at high cardiovascular risk.

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Figures

Figure 1
Figure 1
Cumulative diabetes free-survival by group of intervention. Cox regression models with outcome of diabetes onset and exposure to MedDiet intervention group vs. control diet group, adjusted by sex, age, baseline energy intake, BMI, waist circumference, physical activity, smoking status, fasting serum glucose, use of lipid-lowering drugs, Mediterranean diet score, and weight change during the study. a, MedDiet and virgin olive oil group; b, MedDiet and nuts group; c, control diet group.
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Comment in

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