Fats: lipids that not only contain energy for metabolism, but also provide nutrients for many body functions, from cell membranes to hormone production
Partially hydrogenated oils: Asynthetically altered lipid used in processed foods yo prolong the shelflife of food products to avoid rancidity. These oils are thought to be dangerous to the integrity of human physiology and possibly related to cancer and coronary heart disease
Trans fatty acids (TFAs): the result of the hydrogenation process where a cis form of a fatty acid is converted to a trans form, making a liquid fat solid at room temperature. Very unhealthy
Essential: fatty acids that the body cannot produce and therefore must be consumed from outside sources. Omegs 3 (alpha-linolenic) found in flaxseed oil and cold-water fish.