Which Human Foods Are Toxic to Cats? A Complete List

Cats are smaller than dogs, and a lot more sensitive to certain foods that seem harmless in a human kitchen. A bite that would barely register with a person can be a real problem for an 8 or 10 pound cat. Here's what's actually worth keeping out of reach, based on ASPCA Animal Poison Control guidance.

Onions, garlic, and the whole allium family

Onions, garlic, leeks, chives, and shallots all damage a cat's red blood cells if eaten in enough quantity, whether raw, cooked, or powdered. Powdered forms, like the onion and garlic powder in many seasoning blends and some baby foods, are actually more concentrated than the raw vegetable. Symptoms don't always show up right away. Lethargy, pale gums, and vomiting a day or two after exposure can be signs of the red-blood-cell damage catching up.

Chocolate and caffeine

Both contain methylxanthines, compounds cats metabolize far more slowly than people do, which is why a small amount affects them so much more. Darker, more concentrated chocolate (baking chocolate especially) is worse than milk chocolate. Coffee grounds, tea, and energy drinks carry the same risk from caffeine itself.

Alcohol

Even small amounts can cause vomiting, disorientation, breathing problems, and in serious cases, coma. Cats are small enough that this doesn't take much. Unattended drinks and desserts made with alcohol are the usual source of accidental exposure, not deliberate feeding.

Grapes and raisins

These are established as toxic in dogs, where they can cause sudden kidney failure. The research specifically in cats is thinner, but vets generally recommend keeping grapes and raisins away from cats too, on the reasonable assumption that a food this dangerous in one common pet is not worth testing in another.

Xylitol

This sugar substitute shows up in sugar-free gum, some peanut butters, and various "diet" products. It's best known for causing a dangerous drop in blood sugar and liver damage in dogs. Less is documented in cats specifically, but because the risk in other species is so serious, it's treated as something to keep away from cats as a matter of caution rather than something that's been proven safe.

Raw yeast dough

Raw bread dough can expand in a warm stomach the same way it rises on a counter, which is uncomfortable on its own, and the yeast produces alcohol as a byproduct of fermentation as it continues to rise inside the cat. That combination is worse than either problem alone.

Milk and dairy

This one surprises people. Cats lose much of their ability to digest lactose after they're weaned, so a bowl of milk is more likely to cause an upset stomach and diarrhea than anything resembling the treat it looks like in cartoons. It's unpleasant rather than dangerous, but it's genuinely not doing your cat any favors.

Not a food, but worth knowing: lilies

Lilies deserve a mention even in an article about food, because they're one of the most dangerous common household plants for cats specifically, to the point of being disproportionately more toxic to cats than to most other pets. Every part of the plant, including pollen and water from the vase, can cause acute kidney failure. If you have cats, true lilies (Lilium and Hemerocallis species) are worth avoiding in the house entirely rather than just keeping "out of reach."

What to do if your cat eats something on this list

Note what was eaten and roughly how much, then call your vet or an animal poison control line right away rather than waiting to see if symptoms show up. The ASPCA Animal Poison Control Center can be reached at (888) 426-4435. Acting quickly matters more than trying to diagnose the situation yourself first.

Frequently asked questions

My cat licked a small amount of something on this list. Is that an emergency?
It depends heavily on what and how much, and your cat's size and health. When in doubt, a quick call to your vet or poison control is worth it. It's a much better outcome than assuming it's fine and being wrong.

Are there human foods that are actually fine for cats?
Plain cooked chicken, small amounts of plain fish, and plain cooked eggs are generally fine in moderation. Anything seasoned, sauced, or fatty is where the risk usually creeps back in.

Is tuna safe for cats?
In small amounts occasionally, yes, but it shouldn't become a regular meal. Tuna isn't nutritionally complete for cats on its own and can contribute to mercury exposure over time if fed often.

Sources

This article is for general information and isn't a substitute for advice from your own veterinarian or emergency veterinary care. If you believe your cat has eaten something dangerous, contact your vet or poison control immediately.