MSG is more used to the diet than you know

McDonald's wants to go into the chicken sandwich battle between Popeyes and Chick-fil-A, currently taking place.

And the fast-food chain would look for the most commonly controversial ingredient in Chinese food to boost its sandwiches.

According to CBS News, monosodium glutamate or MSG is the main ingredient in a couple of chicken sandwiches that McDonald's has marketed at 230 restaurants in Texas and Tennessee.