Cats eat grass for the following main reasons: Firstly, eating grass can supplement vitamins. Secondly, cats eating grass can promote peristalsis in the gastrointestinal tract and help digestion. Thirdly, cats eating grass has an emetic effect and helps to vomit out the hairballs in their bodies. Because cats often lick their hair, they will eat it when they lick it and it will form indigestible hairballs in their stomachs.
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