An unsaturated fatty acid in which the chain of carbon atoms is missing two or more pairs of hydrogen atoms. Found in nuts, fatty fish oils, and vegetable oils such as soybean, safflower and sunflower.
A fatty acid that is missing more than one pair of hydrogen atoms. Polyunsaturated fatty acids are mostly found in plant and sea foods. Safflower oil and corn oil are high in polyunsaturated fatty acids. Polyunsaturated fatty acids tend to lower levels of both HDL-cholesterol and LDL-cholesterol in the blood.