Fats， both of animal and vegetable origin， are the most manipulated of food components. Modern pet food processing not only changes the balance in the kinds of fats consumed， but can alter their chemical structure and render them toxic. (For example， the growing problem of human heart disease is not a result of natural fat， but of processed， oxidized fats.) Wysong EFA cat and dog supplement provides beneficial fatty acids， including omega-3， -6 and -9， which have been found beneficial in a variety of diseases including allergic conditions. (For further details on the role of fats and oils in health and disease， order Lipid Nutrition， by Dr. Wysong.)