well .... there are lots f peole who will say "don't ever give your cat anything but cat food".... and then there are those who will tell you some thing else...
the best thing to do is just print out this list, and put it on your fridge -
and then you'll have better idea of what to feed and not to feed, because there are no hard and fast rules about treating, just be aware of the toxic stuff and you avid that and you should be fine.
Items to avoid Reasons to avoid
Alcoholic beverages Can cause intoxication, coma, and death.
Baby food Can contain onion powder, which can be toxic to cats. (Please see onion below.) Can also result in nutritional deficiencies, if fed in large amounts.
Bones from fish, poultry, or other meat sources Can cause obstruction or laceration of the digestive system.
Canned tuna (for human consumption) Large amounts can cause malnutrition, since it lacks proper levels of vitamins and minerals.
Chocolate, coffee, tea, and other caffeine Contain caffeine, theobromine, or theophylline, which can be toxic and affect the heart and nervous system.
Citrus oil extracts Can cause vomiting.
Dog food If accidental ingestion, will not cause a problem; if fed repeatedly, may result in malnutrition and diseases affecting the heart.
Fat trimmings Can cause pancreatitis.
Grapes and raisins Contain an unknown toxin, which can damage the kidneys.
Human vitamin supplements containing iron Can damage the lining of the digestive system and be toxic to the other organs including the liver and kidneys.
Large amounts of liver Can cause Vitamin A toxicity, which affects muscles and bones.
Macadamia nuts Contain an unknown toxin, which can affect the digestive and nervous systems and muscle.
Marijuana Can depress the nervous system, cause vomiting, and changes in the heart rate.
Milk and other dairy products Some adult cats and dogs do not have sufficient amounts of the enzyme lactase, which breaks down the lactose in milk. This can result in diarrhea. Lactose-free milk products are available for cats.
Moldy or spoiled food, garbage Can contain multiple toxins causing vomiting and diarrhea and can also affect other organs.
Mushrooms Can contain toxins, which may affect multiple systems in the body, cause shock, and result in death.
Onions and garlic (raw, cooked, or powder) Contain sulfoxides and disulfides, which can damage red blood cells and cause anemia. Cats are more susceptible than dogs. Garlic is less toxic than onions.
Persimmons Seeds can cause intestinal obstruction and enteritis.
Potato, rhubarb, and tomato leaves; potato and tomato stems Contain oxalates, which can affect the digestive, nervous, and urinary systems. This is more of a problem in livestock.
Raw eggs Contain an enzyme called avidin, which decreases the absorption of biotin (a B vitamin). This can lead to skin and hair coat problems. Raw eggs may also contain Salmonella.
Raw fish Can result in a thiamine (a B vitamin) deficiency leading to loss of appetite, seizures, and in severe cases, death. More common if raw fish is fed regularly.
Salt If eaten in large quantities it may lead to electrolyte imbalances.
String Can become trapped in the digestive system; called a "string foreign body."
Sugary foods Can lead to obesity, dental problems, and possibly diabetes mellitus.
Table scraps (in large amounts) Table scraps are not nutritionally balanced. They should never be more than 10% of the diet. Fat should be trimmed from meat; bones should not be fed.
Tobacco Contains nicotine, which affects the digestive and nervous systems. Can result in rapid heart beat, collapse, coma, and death.
Yeast dough Can expand and produce gas in the digestive system, causing pain and possible rupture of the stomach or intestines.