Let’s take a look at the ingredients in a typical can of cat food: meat by-products, chicken by-product meal, turkey by-product meal, ash, taurine. Nothing too horrible, but in general, these things don’t constitute a healthy human diet, says Dawn Jackson Blatner, a registered dietitian with the American Dietetic Association. “That said, I’m fully confident that your body can handle kitty chow.”
Your liver, kidneys and skin do a terrific job of removing foreign substances from the body, especially mild ones like those found in cat food. “Technically, you could safely digest a baseball,” Blatner says. Perhaps the worst stuff in cat food is the high mineral content in the ash, but your body would clear that out quickly.