There is an old saying that a well fed cat is a contented cat. This means that the opposite must also be true as a cat that is still hungry will pester you for more food. However, and there is always an however, some cats can be greedy and demand more food than they actually need.
If you think you are feeding your cat enough but he's still pestering you, try weighing him. To do this hold him while you're on the scales then weigh yourself without him. The difference is his weight. Check the