Like many people, we believed that the lethargic, scraggly, 14 year old cat someone gave us was simply the result of his advanced age. However, we had just switched our 8 yr old cat to Instinct (severe food sensitivities), and naturally, the 14 yr old cat began eating the same. Within 2 WEEKS - we saw a dramatic change in both cats. The vomiting stopped in the 8 yr old, and the 14 yr old began growing in healthy fur; he had TONS of kitten like energy, and was gaining weight. We are now 16 weeks into the Instinct feeding, and Fred (14 yr old) is unrecognizable. Gone is the feeble, arthritic, patchy & dull fur; in its place is a cat that is literally enjoying a new life as a healthy, energetic and gorgeous "young" cat. And Red (the 8 yr old) has also made a complete turn around. Not only has the vomiting stopped, but his energy level is back to that of a kitten as well! I will always feed Instinct to my cats from now on!