5. Margarine
Margarine was a product originally developed as a healthier alternative to butter, but in reality it is the exact opposite. Made with hydrogenated vegetable oils, it is basically pure trans fats that will damage your heart and blood vessels, as well as raise your cholesterol levels.
Real butter in moderation is actually the better choice between the two. We recommend using olive or avocado oil as a substitute wherever possible, though. It can be flavored with garlic and/or herbs to create a really pleasing taste in dishes or spread on whole grain bread.