According to Fox News in their article Taco Bell Sued Over Meat That's Just 35 Percent Beef, a class action lawsuit was filed that claims Taco Bell's use of the phrases "seasoned ground beef" or "seasoned beef" is false because the meat contains 65% water, wheat oats, soy lecithin, maltodrextrin, anti-dusting agent, and modified corn starch.

Taco Bell adds these things because it's cheaper to produce than real beef.

The lawsuit is not requesting monetary damages, but rather that they discontinue the use of the word "beef" in their marketing materials.

KnowThis.com reports that Taco Bell is vigorously defending that their marketing is not misleading:

Taco Bell is not taking these charges lightly and has responded with an all-out PR campaign including the placement of full-page ads in major U.S.newspapers explaining exactly what is in their tacos.

Regardless of which side wins the lawsuit, it'll be interesting to see how the public responds to what is basically a public-awareness campaign of the quality of food Taco Bell produces. 

Will this decrease their overall sales?