Video: The Cat Loves To Eat Grass. Isn't It Harmful?
Despite the fact that our cats are inveterate meat eaters, from time to time, if possible, they eat young grass. Maybe they get some additional minerals and vitamins. It is known that ready-made food contains not enough foliar acid - one of the B vitamins, which is abundant in grass.
It is also very likely that cats eat grass because of their need for fiber to help avoid constipation. Wild cats eat both grass and the insides of killed or herbivores. Some domestic cats can eat young bean shoots, houseplants, and flowers in a vase.
Cats with digestive upsets can eat very large amounts of grass and then vomit - that is, they use the green as a natural emetic. They probably do this when they feel lightheaded and deliberately induce vomiting.
In general, eating grass is not harmful to a cat, unless, of course, she has been treated with herbicides. You can buy a bag of seeds and plant oats in the room. This will avoid possible poisoning and provide grass for cats living in the city; especially those who need to wean from eating houseplants.
Source: H. Nepomniachtchi "Keeping a cat"