Trans fatty acids are also called trans fatty acids, and the content of trans fatty acids in natural foods is very small. Most of the trans fatty acids that people usually eat are made from the hydrogenation of vegetable oil. This is a manual processing process, that is, the liquid unsaturated fat in vegetable oil is hydrogenated and hardened. To put it bluntly, it is to change liquid vegetable oil into solid or semi-solid oil in order to prevent deterioration, facilitate storage or improve taste. This is a trans fatty acid.

At present, trans fatty acids are widely used in food by food processors. Because trans fatty acids are added to food, it will increase the taste of food and make it more crisp and delicious. Trans fatty acids are usually found in western cakes such as margarine and cream cakes, baked goods such as biscuits, crackers, shortcakes, doughnuts, potato chips and fried fast food such as French fries and fried chicken pieces.