6 Foods that are Dangerous to Cats – In the world of cat food, there are some important differences between food poisoning and poisoning your cat. Food poisoning is a medical condition caused by the consumption of contaminated food, which can lead to nausea, vomiting, diarrhea, and dehydration. Cats are pickier than humans when it comes to food. This is because they have a different taste and smell mechanism in their mouths which is why they can’t taste some of the same things that humans can. Some of the most dangerous foods for cats are chocolate, onions, raisins, macadamia nuts, garlic, and grapes.