Here is a partial list of foods to watch out for:
Fried foods (Fried chicken, French fries, fried onion rings, tater tots, etc)
Cookies
Crackers
Biscuits
Frostings
Pies
Pastries
Frostings
Doughnuts
Corn chips
Taco shells
Shortening
Partially hydrogenated vegetable oils
Refined vegetable oils
Baked goods (Croutons, crackers, cookies, cakes, breads)
Margarine