All Young Again foods work well with cats suffering from IBS/IBD and you should not hesitate to try one. However, our Limited Ingredient Diet (LID) is superior, because the protein used is hydrolyzed and it uses psyllium soluble fiber. Hydrolyzed protein is partially digested/broken down meat and is highly digestible. Soluble fiber is gentle on a sensitive cat’s digestion and helps maintain good stool quality. With a cat suffering from IBS/IBD, it may take 2-3 months to see the benefits of a diet change. Be patient.