I know that fancy feast is not the optimal food but that seems to be all my cats will eat. I have thrown away So much money on food that they will not eat. Is there any supplement I could add into this less than adequate food to make it not as dangerous for them to eat. I know that by products are cancer-causing and that is what is in all these foods please tell me if there’s anything I could add to the food to make it more nutritious for them.