Trans fats not only raise the level of bad cholesterol just like saturated fats, but they also lower the good cholesterol that protects you from heart disease and increase inflammation. Many food manufacturers have removed or reduced trans fat. But it still can be found in many foods. Here is a list to watch.
Anything fried or battered
Trans fat is made by adding hydrogen to vegetable oil, so it is smart to think that anything fried or battered may have trans fat. You can always ask about the oil that the food is fried in but even if the answer is vegetable oil, it can still be hydrogenated. Your best action will be generally limiting consumption of fried foods, which are not the best for you.
Pie and piecrust
Baked products are notorious for containing trans fat, but many major restaurant chains have removed hydrogenated oils from their pies. You can still find some trans fat varieties in your grocery store. Many varieties of frozen fruit and cream pies have between two and five grams of trans fat per serving. As for piecrust, frozen deep dish all vegetable piecrust contains 2 grams of trans fat per serving. Look for those without hydrogenated oils in the ingredients list.