A recent study examines the effect of trans fat versus unsaturated fat and finds that trans fat is significantly worse for you than unsaturated fat. Calories consumed as trans fat are likely to increase your waistline and weight far more than unsaturated fats.
Trans fat is commonly found in fast food and packaged snacks. Olive oil, vegetables, and nuts are typical sources of unsaturated fat.
In the study, a group of monkeys were fed a controlled diet for six years. All monkeys received the same caloric intake, including 35 percent fat, intended to be representative of a typical Western diet. One group of monkeys consumed 8 percent of their diet as trans fat, while the other group did not consume trans fats.