In this exclusive factory tour, we take you inside the world of large-scale nugget production to uncover the secrets behind how McNuggets are made in one of the most advanced food processing ...

Processing, though ... Many researchers, though, have studied randomly picked chicken nuggets from popular food chains. According to one study, the first nugget was only 50% muscle tissue.

Soon after, the Chicken McNugget was born," the McDonald's website says. McNuggets were tested in a few markets and were an immediate hit. In 1983, they were added to menus in the United States.

Almost 10 years ago, the Department of Agriculture gave Chinese processing plants the ... products — such as canned chicken noodle soup and chicken nuggets — back to America.