Well they can tell good from bad food. Although good isn't necessarily expensive. The two strays we've got will devour the cheapo meat cubes we offer them from the butcher. I saw this thicc kitty in another video, and the owners were feeding it 4x the recommended amount of kibble. It weighed nearly double what it was supposed to be. So the show host got them 4 full size pizzas and said that's how much they would be scoffing down in comparison, so they understood and stuck with the diet plan.