During this high heat process of turning liquid oil into a solid, free radicals are formed, which can increase your risk of cancer, heart disease, and hormonal imbalances. (byrdie.co.uk)
For example, scientists question the effect of heating processes on the overall nutritional value of dog food, despite the addition of amino acids and vitamins as supplements. (policygenius.com)
Thus, some dog guardians choose to add supplemental Omega - 3 oils to their dog's diet to replace those that have been destroyed during heat processing. (petpeoplesplace.com)