Small quantities of trans-fatty acids can raise LDL (bad) cholesterol levels and lower HDL (good) cholesterol levels. It can seriously increase the risk of diabetes. They are abundant in cookies, crackers, snacks, and fast foods under the "fat free" label. Trans-fats are responsible for the obesity epidemic in the U.S. Trans-fats are sometimes where you least expect them (Nabisco's animal crackers, for instance), so reading labels is essential. Fleischmann's made with olive oil and Fleishmann's Light are a healthy choice because these products do not contain trans-fats. Beware of products that do not proudly display on their labels Trans-Fat free.