Vegetables supply carbohydrates and vitamins for your bird, but they should not make up more than 40% of your bird’s daily diet. Try to avoid celery, lettuce, and related vegetables because they are very low in nutritional value. Vegetables can be fed fresh (cleaned first, of course) or cooked. Remember to remove uneaten cooked foods within 30 minutes to prevent spoilage and disease problems. Some of the most common vegetables used to feed birds are corn, beans of all types, carrots, chili peppers, peas, potatoes, radishes, and squash (all types).
Fruits supply sugars, which are used as a quick energy source, but should not make up more than 10% of the diet. With such a high sugar content, fruits can spoil very quickly and can also attract bugs. Always remove the uneaten portions within 30 minutes for sanitary reasons. Almost all fruits are safe, but should always be washed thoroughly before placed in the cage. Some of the most common fruits used as dietary supplements are apples, bananas, berries (all types), melons (all types), oranges, peaches, pears, plums, raisins, and pineapple. Please do not offer your bird avocado or the fruit pits. These can cause severe digestive problems.
For the maximum nutritional benefit, try to vary the fruit and vegetable offerings as much as possible. Not only does this vary the nutritional intake, but it also creates a sense of anticipation and surprise for your bird as the offerings change daily.