Trans Fatty Acids are man-made fats formed from liquid oils. When hydrogen is added to liquid vegetable oil, followed by pressure, the result is a stiffer fat.
Trans fats pose a higher risk of heart disease than saturated fats, which were once believed to be the worst kind of fats. While saturated fats raise total cholesterol levels, trans fats go beyond that. Trans fats raise total cholesterol levels, but they also deplete good cholesterol, which helps protect against heart disease.