These are byproducts of hydrogenation. This is a chemical process used to change liquid unsaturated fat to a more solid fat. Trans fats will be found in an ingredients list as a partially hydrogenated oil. Trans fatty acids are similar in structure to saturated fat. They may have a great impact on raising total cholesterol and LDL cholesterol levels. You should avoid trans fats as much as possible.
Examples of trans fats include stick margarine and fats found in commercially prepared cakes, cookies, and snack foods.
Your total fat intake should be no more than 30% of your daily calories.