Yes, cats can eat mushrooms — but only commercially grown varieties from reputable sources, and only in moderation. Cats should NEVER eat wild mushrooms, some of which can be toxic or even deadly. For example, the Amanita phalloides, also known as the death cap mushroom, can cause organ failure and death in cats and humans alike.
But some types of safe, store-bought mushrooms contain healthy nutrients like fiber, protein, minerals, antioxidants, as well as vitamin D and B vitamins. These nutrients can aid in metabolism, digestion, immune function, and bone health.
Cooked mushrooms are easier for cats to digest than raw ones. And remember, you should never feed your cat seasoned mushrooms, or mushrooms cooked in butter, as salt, butter, and other seasonings are unhealthy for cats. Some seasonings, like those derived from garlic or onions, are even toxic.
Also, keep in mind that you should only feed your cat mushrooms in moderation, as an occasional treat. Cats are obligate carnivores, which means they need to get most of their nutrients from meat-based foods.
As always, before introducing a new food item into your pet's diet, consult with your veterinarian first. If your cat eats mushrooms (or any food) and is showing signs of illness such as lethargy, diarrhea, or vomiting, reach out to your veterinarian immediately. If they require veterinary care related to eating any unsafe foods, pet insurance can help cover the cost of treatment.