We first tried foraging after our blue-crown conure started feather chewing. Our avian vet suggested we try foraging as a way to distract him from his tasty feathers.
Some pellet manufacturers use the compressed method and some use the expanded method to make the pellets. A few do not contain any of some or any of the following ingredients.
NOTE: Many birds will start eating healthier foods if they can see the food in full-spectrum lighting. Birds can actually see nutrition in their food, with proper lighting. In low light, they cannot even see in color.