We all know we shouldn’t eat fast food because it’s bad for us, but part of the reason is because of all the trans fats and other additives they use to make the food taste good. The problem is not just that there is trans fat in the foods, but that the portion sizes quickly multiply those contents and before long you have a week’s worth of trans fat in one meal. A large french fry from McDonald’s supplies 4 day’s worth of trans fat by itself.