Trans fatty acids (TFAs) are fats that can be naturally found in several foods that many people eat on a daily basis e.g. dairy products. Industrial trans fatty acids (or partially hydrogenated fats) are, as the name indicates, man-made and are added to several processed foods. They are used to improve product texture for example in margarines, cookies, baking products or snacks. High consumption of trans fatty acids is associated with increased risk of cardio-vascular disease and therefore efforts by many actors worldwide aim to decrease the levels of industrial trans fatty acids in foods and in diets.