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Key ingredient of study: use of extra-virgin olive oil, not calorie counting or exercise
Adults at risk for heart disease who eat a Mediterranean diet rich in olive oil can lower their chances of developing diabetes, even without restricting calories or boosting exercise, new research suggests.

In the study, Spanish researchers followed more than 3,500 older adults at high risk of heart disease. The researchers assigned them to one of three groups: a Mediterranean diet with extra-virgin olive oil, a Mediterranean diet supplemented with mixed nuts, or a low-fat diet, which served as the comparison. They did not get special instructions on losing weight or increasing their physical activity.
A Mediterranean diet focuses on fruits, vegetables, whole grains and fish, besides the olive oil.
Those in the nut group were allowed about an ounce a day of walnuts, almonds and hazelnuts. Those in the olive oil group were allowed a little more than three tablespoons daily.
The researchers followed the men and women, aged 55 to 80, for about four years, between 2003 and 2010. During the follow-up, 80 in the olive oil group developed type 2 diabetes, while 92 in the nuts group and 101 in the comparison diet group did.
After adjusting for other factors affecting diabetes risk, the researchers found those in the olive oil group reduced diabetes risk by about 40 percent compared to the comparison diet group. Those in the nuts group reduced risk by 18 percent, which was not statistically significant.
The new research, published online Jan. 7 in the Annals of Internal Medicine, is good news, said Dr. Christine Laine, editor-in-chief of the journal and an associate professor of medicine at Jefferson Medical College in Philadelphia.
The study “suggests it is possible to reduce the risk of diabetes by changing the composition of your diet. It is another piece of evidence that the Mediterranean diet has health benefits,” said Laine, who was not involved in the research.
She hopes the findings don’t discourage people from diet and exercise. Excess weight is a risk factor for type 2 diabetes, she said, and diet and exercise can help control weight. Adding diet and exercise to the Mediterranean diet could theoretically reduce the diabetes risk even more, she noted.
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SOURCE: WebMD News from HealthDay
Kathleen Doheny
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