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Hydrogenation is a chemical process in which hydrogen gas is bubbled through a liquid oil in the presence of a catalyst, often a reactive metal such as platinum or nickel. The resulting reaction forces unsaturated fatty acids to accept additional hydrogen atoms and become at least partially saturated.
Definition of Hydrogenation. Hydrogenated fats and oils are common terms you may have encountered at your local grocery store. On food labels, you can likely find at least one container that reads 'does not contain hydrogenated fats.' Although there are several nutritional warnings against these types of fats, have you ever wondered how these are generated in the first place? Well, the answer lies in a chemical reaction called hydrogenation.