This refined carbohydrate is white flour, an ingredient that is present in the composition of all cookies, whether they are filled or not. This flour is low in fiber (the nutrient that helps promote satiety in the body, remember?) And is associated with effects such as weight gain and constipation. Trans fats Most stuffed cookies have trans fats, which are added for consistency and shelf life. This is the worst type of fat that can raise bad cholesterol and lower good. For a healthy weight loss or fitness, that's not good. But that's not all - trans fats get fatter than other foods even when the same number of calories are consumed.