Trans fats are a special kind of unsaturated fats used in the food industry to increase the shelf-life of a product. Trans fats are not essential and their consumption increases the risk of coronary heart disease by raising levels of "bad cholesterol" and lowering levels of "good cholesterol". Examples of food containing saturated fats are deep-fried fast foods, bakery products, packaged snack foods, crackers and margarines. The term “partially hydrogenated” on food packages is a good indication that such foods contain trans fats.