It is also okay to remove his seed for most of the day, offering it only for an hour in the morning, and an hour in the evening. During the day he will have only fruits and vegies to eat. If he is a little hungry, he will try new foods. Out in the wild, birds eat a wide variety of nuts, small pieces of meat, even another bird's eggs occasionally. A good rule of thumb is, if a food is healthy for a human, it is healthy for your bird.
Birds enjoy spaghetti or a bit of chicken.
Hard boiled egg is often a big hit. Almonds, walnuts or other nuts are fine in small quantities. Many birds love cheeses and yogurt. Monkey chow is a tasty treat and an excellent source of protein for birds. It is available at most pet stores.