Every cat has an entire ecosystem living within them - the gut microbiome, full of billions of desirable & undesirable bacteria unique to your pet. The right nutrients help balance their microbiome. You can actually affect not only their digestive health, but their overall well-being during their golden years. That's why we developed Science Diet Perfect Digestion dry cat food with our ActivBiome Technology ingredient blend of prebiotics. It's breakthrough nutrition supports each cat's unique gut microbiome for healthy digestion and balanced nutrition to help your cat age 7 feel their best.