Polyunsaturated Fatty Acids: Recommendations from the National Cholesterol Education Program

NCEP Evidence: Linoleic acid*, a polyunsaturated fatty acid, reduces LDL cholesterol levels when substituted for saturated fatty acids in diets (Strength of Evidence: A1,B1). Polyunsaturated fatty acids can also cause a small reduction in HDL cholesterol when compared with monounsaturated fatty acids (B2). Controlled clinical trials indicate that substitution of polyunsatuarated fatty acids for saturated fatty acids reduces risk for CHD (coronary heart diseases) (A2,B2).

NCEP Recommendations: Polyunsaturated fatty acids are one form of unsaturated fatty acids that can replace saturated fat. Most polyunsaturated fatty acids should be derived from liquid vegetable oils, semi-liquid margarines, and other margarines low in trans fatty acids. Intakes of polyunsaturated fat can range up to 10 percent of total calories. (Note: recommendation for monounsaturated fatty acid is a higher at up to 20 percent of total calories).

*Linoleic acid is a colorless to straw-colored, polyunsaturated fatty acid that is liquid at room temperature and of the omega-6 series. Good sources of linoleic acid from vegetarian sources are sunflower oil, and safflower oil.