What fats should you watch out for if you want to stay in shape and stay skinny?

Types of fats: Any fat in excess can lead to weight gain.All fats have the same number of calories but health wise- here are some to avoid: saturated fats- butter, lard, fatback & solid shortening. Trans fats- vegetable shortening, select margarines, food fried in partially hydrogenated oil (or containing it), & many types of cookies, snacks & crackers.