How much food should an adult cat eat a day?

Depends on the cat. Smaller, lighter cats will naturally eat less, whereas a bigger or bulky cat will eat more. That said, a cat will eat far more if fed a lower quality food to get the nutrition it needs, and will eat much less if fed a premium quality food that has a high meat content and no grains.

The best way to find out how much you should feed your own cat is to keep an eye on his or her weight. You can do this by weighing him once a week to see if he gains or loses weight, or feeling for any extra layers of fat over his ribs. Be sure to consult a veterinarian first in order to find out the cat's weight and health.