Scientists May Have Solved One of the Great Cat Mysteries: Why Do They Eat Grass?

If you have an outdoor cat or you’ve ever let your cat outside for a spell, you might notice that your feline companion loves to nibble and chew on grass. Dogs do it too, obviously, but it’s less alarming with them because most pups will eat just about anything. We also know that dogs tend to do it to relieve stomach issues and induce vomiting, often purging something troubling they ate in the process.

Cats are much more picky about what they interact with, and particularly what they munch on, however. So, it’s a much bigger mystery about why they eat grass, at least it has been until now. Scientists believe they may have figured out why cats do this.

Why Do Cats Eat Grass?

kitten outdoors in foliage

Research findings were recently presented at the International Society for Applied Ethology’s annual meeting in Bergen, Norway. Researchers from the University of California conducted a widespread survey that included over 1,000 cat owners, all of whom spend at least three hours a day with their pets and are aware of their companion’s activities.

It turns out that 71 percent of those cats were observed eating grass, and only a quarter of them vomited afterward. What’s interesting is that 91 percent of the cats did not appear to be sick before they ate the grass.

Like dogs, they are imbibing upon the greenery to kickstart stomach activity. However, the scientists say it’s not due to an act of self-medication, but more of an “evolutionary behavior” that’s centuries old. According to the researchers, cats eat grass to expel intestinal parasites as their ancestors did.

After eating the grass, the muscles in their digestive tract see an increase in activity which helps to expel unwanted stomach contents.

Since cats are natural hunters, going after rodents — which can be disease and parasite riddled — it’s clear the instinct is designed to protect them.



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