You should feed your cat carefully. And you should also remember that not all foods are good for your pet. Otherwise it may affect your cat negatively. Many owners think that what is okay for them would be fine for their pets too. But they are mistaken to think so. Not all human foods are intended for cats.
Never feed your cat with onions. This product is very healthy for people but not for cats. In fact it may cause serious problems. And it concerns not only cats. Avoid feeding pets with onions in general. Otherwise it would cause so called Heinz body anemia and as the result it causes kidney damage. Garlic and chives must be also excluded.