TOP 5 Things Your Cat Should NOT Eat

1. Dog food
Cats and dogs are two different stories. Their bodies function in distinct ways and they have different nutritional needs.
The main difference between cat and dog food is an amino acid called Taurine. All cat formulas have this ingredient added, because cats need it in their diet. Dogs, on the other hand, don't need taurine in their food, as their bodies can produce it. So, a cat eating dog food will be deprived is this important amino acid. Taurine deficiency can lead to severe heart disease and other health problems.
Cats also require more protein and a different form of Vitamin A than dogs do.

2. Home made food
You may think that cooking for your cat is better than feeding her kibbles. Home made food should be tastier and safer, because you can control the freshness and quality of the ingredients. While it is ok to give your cat, from time to time, a little piece of the steak you are preparing, a regular diet of home made food can deprive your cat of many essential nutrients.
Here are two examples (Source: Waltham pocket book of essential nutrition for cats and dogs):

Recipe 1:  3 parts rice; 2 parts chicken breast; 1 part cooked vegetables.
Cats need: 12 times more Vitamin E.

Recipe 2: 2 parts rice; 1 part steamed fish.
Cats need: 2 times more fat; 2 times more Zinc; 2 times more Vitamin E; 2 times more Vitamin B12.

3. Onions/Garlic
The substances in onions and garlic that are dangerous for cats are the thiosulfate compounds. Thiosulfates, together with other substances and through chemical process, are what causes teary eyes when cutting onion.
This substance can brake down a cat's red blood cells, leading to a form of anemia, called Heinz Body Anemia. These compounds can be found in all forms of onion - raw, powdered, cooked or dehydrated.

4. Chocolate (including white chocolate)
You may think that chocolate is a tasty treat, but it can be lethal for cats. The toxic agent is a substance called Theobromine, also known as Xantheose, and it can be found even in white chocolate. The most dangerous types are black and unsweetened baking chocolate.
Theobromine acts as a heart stimulator and vasodilator. Eating chocolate can cause abnormal heart rhythm, epileptic-like seizures and even death.

5. Sugar free sweet foods
Some products like candy, diet foods and even toothpaste are sweetened with Xylitol. This substance will cause an increase in insulin level which results in a blood sugar drop.
After eating products containing xylitol a cat will start to vomit. She will be lethargic and seizures   may occur. There is also a high risk of liver failure within a few days.