From the Manufacturer:
Most people think that avoiding all fat is the path to true health, but in reality there are two substances that can only be found in fat that are just as necessary to our survival as proteins, carbohydrates, vitamins and minerals. Of the many kinds of fats, only the ones called Omega 3 and 6 have been designated as essential fatty acids (EFAs) by scientists, because every living cell in the body needs these fats, but the body can't make them on its own. A direct food source is always required.