Noticeably improves cats' appearance On the advice of my vet way back in 1996 or 1997, I began feeding my cats Hill's Science Diet dry cat food. Those cats have since passed, and we adopted and were adopted by more cats. It is remarkable the effect that this food has on their coats and overall appearance and health. 3 years ago when we moved, our new vet recommended switching to the Light formula because she said that orange tabbies are more predisposed to developing diabetes. Within 3 months, all 4 of our cats looked noticeably leaner yet still had their healthy, glossy coats. Switching to this food has a hidden benefit: this food is so nutritionally dense that you will see noticeably smaller waste output.