A type of fat found in foods from plants and fish, such as sunflower oil, fish oil and some margarines and spreads. Eating polyunsaturated fats rather than saturated fats helps to reduce the blood cholesterol level.
A type of unsaturated fatty acid in which the chain of carbon atoms is missing two or more pairs of hydrogen atoms. Polyunsaturated fatty acids are found in nuts and vegetable oils such as soybean, safflower and sunflower, and in fatty fish oils. When used instead of saturated fats, polyunsaturated fats tend to lower LDL cholesterol levels. Soybean oil contains approximately 61 percent polyunsaturated fatty acids.