Many familiar ingredients, including chicken, beef, and corn are incorporated into dry food as meal. This simply means the ingredient has been ground up into a powder.By-product, as in chicken by-product, incorporates extra parts of the chicken into the recipe. In Diamond foods, by-product mostly comprises chicken liver, digestive tract, kidneys, and bone, though there may be other parts that aren’t easily identifiable or made readily available to consumers. This by-product composition is generally high in protein, though some consumers are averse to the potential inclusion of chicken feet, tongue, and head. Keep in mind that ingredients are listed in order of percentage included. Check the first three to five items listed to get a pretty accurate idea of what’s in the food.