The traditional Mediterranean diet provides substantial protection against type 2 diabetes, according to a study published on bmj.com today.

The Mediterreanean diet is rich in olive oil, grains, fruits, nuts, vegetables, and fish, but low in meat, dairy products and alcohol.

Current evidence suggests that Mediterranean diet has a protective role in cardiovascular disease, but little is known about its role on the risk of developing diabetes in healthy populations.

 

Participants initially completed a 136 item food frequency questionnaire designed to measure the entire diet. The questionnaire also included questions on the use of fats and oils, cooking methods and dietary supplements.

Every two years participants were sent follow-up questionnaires on diet, lifestyle, risk factors, and medical conditions. New cases of diabetes were confirmed through medical reports.

During the follow-up period (median 4.4 years) the researchers from the University of Navarra found that participants who stuck closely to the diet had a lower risk of diabetes. A high adherence to the diet was associated with an 83% relative reduction in the risk of developing diabetes.

Interestingly, those participants who stuck strictly to the Mediterranean diet also had the highest prevalence of risk factors for diabetes such as older age, a family history of diabetes, and a higher proportion of ex-smokers. This group of participants was therefore expected to have a higher incidence of diabetes, but this was not the case. If fact, say the authors, they had a lower risk of diabetes, suggesting that Mediterranean diet might provide substantial protection.

The major protective characteristics of Mediterranean diet include a high intake of fibre and vegetable fat, a low intake of trans fatty acids, and a moderate intake of alcohol.

In addition, a key element of Mediterranean diet is the abundant use of virgin oil for cooking, frying, spreading on bread, and dressing salads. 

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