Trans fatty acids are found in vegetable shortenings, some margarines, crackers, cookies, snack foods, and other foods. The debate continues over how much trans fatty acids people should eat. Current U.S. government nutrition policy does not include official dietary guidelines for how much trans fatty acids to eat. So in the meantime, lowering the intake of trans fatty acids probably makes sense. They are usually found in fish such as salmon, tuna, sardines, and trout.
Most fish are low in both saturated and total fat.
You should try to eat a serving of 4-6 ounces of fish 4 times per week. Fat replacers are intended to replace part or all of the fat in a product. They are usually in the form of carbohydrates, proteins, or fatty acids. You can digest them easily and they provide only 4 calories per gram. They also provide 4 calories per gram.