Pelleted food is a blend of grains, seeds, vegetables, fruits and various protein sources. Pellets also are convenient for bird owners. Pelleted foods should be the foundation of your bird's diet, but they're not enough. Skip the guacamole, though, because avocados can be a deadly treat for birds. Excessively fatty foods should be avoided, too.
Most pet birds are perch potatoes, prone to obesity.
In addition to rounding out a commercial diet, fruits, nuts and other people food gives your bird something to keep him occupied and entertained. Clean it, of course, but make your bird work some to eat it. Just be sure pellets and fresh water are available at all times. Given in small amounts, seeds are a wonderful way to help teach your bird tricks or reward him for good behavior. But they should be a treat, not a staple, to ensure proper nutrition for your bird.