Hydrogenated fat is made through a process that involves adding hydrogen atoms to a polyunsaturated vegetable oil. It basically turns an unsaturated oil into a semisolid saturated fat. This procedure eliminates the beneficial qualities of the polyunsaturated fat but allows one to use a solid as an ingredient where a liquid would not work. Additionally, hydrogenation prevents or retards the spoilage of polyunsaturated oils. Hydrogenation also creates trans fatty acids, which may increase blood cholesterol levels. Many scientists agree that hydrogenated oil is more detrimental than saturated fat for those with cholesterol concerns.