Margarine used to be considered a healthy alternative to butter. Fortunately, most people have now realized that this is far from being true. Margarine is a highly processed pseudo-food that has been engineered to look and taste like butter.
It is loaded with artificial ingredients, and is usually made with industrial vegetable oils that have been hydrogenated to make them more solid. This increases their trans fat content significantly.
Keep in mind that manufacturers are allowed to label their products with “no trans fat” as long as it contains less than 0.5 grams per serving, which is still a significant amount.
Alternatives: Use real butter instead, preferably from grass-fed cows.