How 14 popular fast-food chains are bulking up their poultry-based offerings with seaweed, beef, soy, oats and WOOD

Fried chicken is a favorite for millions of Americans - but many of the options offered by America's biggest fast food chains contain other unexpected ingredients. 

These restaurants will often fill their food with additives, preservative and even other proteins in order to keep costs to a minimum and give their offerings a longer shelf life. Others may use buzzwords such as 'premium' or 'all-white meat' to describe their poultry-based offerings.  

But more surprising ingredients - such as beef, seaweed and even wood pulp - can be found in the recipe for some chicken-based products at major restaurants.