Cats can usually tell when a certain type of food is bad for them; however, they sometimes need a little bit of guidance concerning nutrition. One type of food cats should not have is tuna that is packed for human consumption. Tuna for humans is not nutritious enough to sustain a cat. Tuna for humans also often contains mercury. According to Consumer Reports, a 5-ounce can of tuna contains approximately 0.018 to 0.774 parts per million of mercury. This level of mercury is dangerous for humans and therefore is poisonous for cats.
Onions and foods in the onion family are dangerous to a cat’s health. These foods can cause a cat to develop anemia. Milk and other dairy products can cause an adult cat to have diarrhea. Alcohol is a death sentence for a cat. Only two teaspoonfuls of whisky can put a cat in a coma. It would be utter cruelty to feed alcoholic beverages to a cat.
Other foods that can have detrimental effects on a cat’s health include grapes, raisins, caffeine, chocolate, candy, gum, fat, bones, raw eggs, raw meat, raw fish, dog food, liver, bread, human medicines, and many other types of human foods and human food ingredients.