Polyunsaturated
Polyunsaturated fatty acids have more than one carbon-to-carbon double bond in their molecular structure and are liquid at room temperature. They can be obtained from oils such as sunflower, soybean, and flaxseed oils, as well as walnuts and fatty fish. (Click here to view sources and serving sizes on the U-M Integrative Medicine Healing Foods Pyramid.) Included in this category are the popular and publicized omega-3 and omega-6 fatty acids.