http://www.huffingtonpost.com/2013/10/24/chicken-nugget-ingredients_n_4153520.html Take, for instance, the chicken nugget. A paper published online last month by The American Journal of Medicine looked at two nuggets from two different, unidentified national fast food chains: Each was comprised of just 50 percent or less muscle tissue, which is what we typically define as chicken, Reuters reported. The rest of the pair of nuggets was made up of a hodgepodge of pure fat, blood vessels, pieces of bone, nerves and cartilage.