Food
Dry food has been a recommended staple diet for cats by many experts for a number of years. It is an easy option to leave a bowl of dry food out constantly; something that cannot be done with tinned food. Unfortunately though, it's not a natural food source and has been developed by humans using many additives and un-natural products. Cats, like humans, will eat until they fill themselves up. However, dry food has many more calories and carbohydrates than a natural food source, which leads to the cat taking in far more than necessary just to feel full-up. Many owners assume that their cat is just greedy, but in many cases it is not the quantity of food being eaten, it is the quality.
Naturally, cats are obligate carnivores; meaning they only feed on other animals. The cats prey however, are generally herbivorous and have various vegetable and plant matter in their guts. All of which, will be consumed by the cat. Domestic cats have been shown to have longer intestines than wild cats; proving they have evolved over hundreds of years to cope with more plant and vegetable matter (carbohydrates). Still, this is no excuse