Birds are creatures of habit and don't like changes, no matter how subtle the change may be. It is unwise to walk directly up to a bird who has never seen you before and try to pick it up or touch it. You could be in for a rude awakening, no matter how friendly or sweet the bird may appear to be. A healthy, varied diet should consist of a wide variety of foods, not just seeds. Dark green leafy vegetables as well as dark red and yellow fruits is a good alternative to a dry parrot mix.
Large macaws relish different and interesting textures.