The California Attorney General has sued McDonald’s and Wendy’s for failing to put warning labels on their french fries telling customers that they contain chemicals that (at very high doses) might cause cancer or other health problems.

According to the article,

The lawsuit alleges that companies have violated a state law passed in 1986 requiring companies to provide warnings before exposing people to known carcinogens or reproductive toxins.

In 2002, scientists found potatoes and other starchy foods cooked at high temperatures contained low levels of acrylamide. Other studies have discounted the potential toxicity of acrylamide to humans…

The U.S. Food and Drug Administration is studying the impact of acrylamide levels in food. In a March press release, the FDA said “acrylamide can cause cancer in laboratory animals at high doses, although it is not clear whether it causes cancer in humans at the much lower levels found in food.“

(Emphasis mine.)