15. Margarine
Margarine was supposed to be a healthier alternative to butter, but as it turns out, margarine is made from hydrogenated vegetable oils and is full of trans fats. Recent studies have suggested that trans fats are way more dangerous than the saturated fats found in butter.
Alternatives – Still go easy on the butter, but choose it over margarine. Olive oil flavored with herbs is also a nice topping for bread or veggies.