Grass contains nutrients just like other greens do. Theyre Filling Up on Nutrients. Heres one more reason why cats eat grass.
When they hunt and eat their prey cats will devour it entirely feathers bones and all. Cats can be purrfectly healthy and still eat grass. While broad grasses seem to have a laxative effect narrow grasses are suspected to help a cat settle an upset stomach. Additionally hairballs can be difficult to digest.