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Heart Disease Health Center

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Are Saturated Fats Heart Healthy?

Study Shows Possible Benefits for Older Women at High Risk for Heart Disease
WebMD Health News

Dec. 8, 2004 -- For decades we've been told that eating saturated fat is bad for our hearts, but new research shows that the opposite just might be true for those at risk for heart disease.

In a study involving older women with heart disease, women who ate the most saturated fat had the least atherosclerosis disease progression in coronary arteries over a three-year period.

Editor's Note: Food Pyramid Replaced

In June 2011, the USDA replaced the food pyramid with a new plate icon.

While the findings may seem to turn the food pyramid on its head, researcher Dariush Mozaffarian, MD, of the Harvard School of Public Health in Boston, says more study is needed to understand its public health implications.

"This is not really what we would have expected to find based on studies in men, but postmenopausal women are not men," Mozaffarian tells WebMD. "This finding may be unique to this population, but we just don't know."

Fats and Carbs Revisited

Saturated fats from the diet are the major determinate of "bad" LDL cholesterol. Diets high in saturated fats, such as those found in animal meat, cheese, milk, and baked goods can increase blood levels of LDL. The American Heart association has recommended limiting the amount of saturated fats in the diet to less that 7% as of part of a heart healthy diet.

The study involved 235 older women who were followed for three years. All the women had some plaque buildup when they enrolled in the trial, and X-ray imaging (angiogram) was used to compare arterial plaque progression at entry with that at the end of the trial.

The women completed a detailed questionnaire asking about the foods they ate, and the findings took into account other risk factors for heart disease, such as age and smoking habits.

On average, fats made up about 25% of the women's diets. In addition to having less plaque buildup, women who ate the most saturated fat had a better balance of good to bad cholesterol -- which protects against heart disease.

Replacing saturated fats with other types of fats, such as monounsaturated fats found in plant sources, did not appear to influence disease progression, but replacing fats with highly refined carbohydrates did. Higher carbohydrate intake was associated with more disease progression.

The findings are published in the November issue of the American Journal of Clinical Nutrition.

"This is consistent with the evidence that eating refined, fiber-poor carbohydrates increases heart disease risk," Mozaffarian says.

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