Pour on the olive oil, preferably over fish and vegetables: One of the longest and most scientific tests of a Mediterranean diet suggests this style of eating can cut the chance of suffering heart-related problems, especially strokes, in older people at high risk of them.
The study lasted five years and involved about 7,500 people in Spain. Those who ate Mediterranean-style with lots of olive oil or nuts had a 30 percent lower risk of major cardiovascular problems compared to those who were told to follow a low-fat diet but who, in reality, didn’t cut fat very much. Mediterranean meant lots of fruit, fish, chicken, beans, tomato sauce, salads and wine and few baked goods.
Mediterranean diets have long been touted as heart-healthy, but that’s based on observational studies that can’t prove the point. The new research is much stronger because people were assigned diets to follow for a long time and were carefully monitored. Doctors even did lab tests to verify that the Mediterranean diet followers were consuming more olive oil or nuts as recommended.
Most of these people were taking medicines for high cholesterol and blood pressure, and researchers did not alter those proven treatments, said one study leader, Dr. Ramon Estruch of Hospital Clinic in Barcelona.
But as a first step to prevent heart problems, “we think diet is better than a drug” because it has few if any side effects, Estruch said. “Diet works.”
Results were published online Monday by the New England Journal of Medicine and were discussed at a nutrition conference in Loma Linda, Calif.
People in the study were not given rigid menus or calorie goals because weight loss was not the aim. That could be why they found the “diets” easy to stick with – only about 7 percent dropped out within two years. There were twice as many dropouts in the low-fat group than among those eating Mediterranean-style.
Researchers also provided the nuts and olive oil. The type of oil may have mattered – they used extra-virgin olive oil, which is minimally processed and richer than regular or light olive oil in the chemicals and nutrients that earlier studies have suggested are beneficial.
The study involved people ages 55 to 80, just over half of them women. All were free of heart disease at the start but were at high risk for it because of health problems – half had diabetes and most were overweight and had high cholesterol and blood pressure.
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