I'll make this plain. Cats are carnivores. Cats eat grasses to pass hair-balls.
For all carnivores, eating the intestines of primary consumers can provide any additional dietary requirements. If any. The reason they eat the intestines: carnivores have no enzymes to digest starchs.
Extraneous information: the domesticated cat has lost the gene sequences that make sweets desirable. Ever notice that your cat doesn't like sweets, but the dog does? Cats do not taste sweets.
Please, for the health of your cats and dogs. Feed them a diet rich in animal proteins. Satisfy their dietary requirements.
More.
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