Why isn't your cat eating?

I am not completely sure, but the only thing I can tell you is that As a cat's body begins the process of shutting down, the animal will gradually refrain from eating and drinking. As a result, you'll also notice a reduction in the amount of urine and feces released, and the urine will begin to take on a darker coloring. I don't want to tell you that your cat is dying so you might want to ask a vet.

It could be as simple as you changed the dish they are using. Avoid plastics, the smell annoys many cats, we use glass or china.