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.