"I had fed my cockatiel on regular seed for the first ten years of his life. I tried extruded food once but my bird didn't seem interested. 10 years ago, someone I met at a friend's wedding who worked for the zoo in some capacity read me the riot act about my feeding practices. She said, "if you fed your bird Doritos for his whole life, he mightnot be interested in carots the first couple of times either. " We decided to give it a try and Gus has never been ill a day in his life! Of note, we prefer the "original" version to the Rainbow -- the Rainbow for some reason makes a huge mess."
