Burger King

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A customer chows down at a Burger King in Springfield, Ill. The No. 3 fast-food chain has announced that all of its eggs and pork will come from cage- and crate-free chickens and pigs by 2017, raising the bar for its rivals. (Associated Press)

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**FILE** Patrons enjoy a meal at a Burger King in Springfield, Ill., on Aug. 24, 2010. (Associated Press)

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In this March 28, 2012 photo, new food items sit on display at a Burger King restaurant in Miami. Burger King launches 10 menu items including smoothies, frappes, specialty salads and snack wraps in a star-studded TV ad campaign. It's the biggest menu expansion since the chain opened its doors in 1954. (AP Photo/Luis M. Alvarez)

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In this March 28, 2012 photo, patrons dine at a Burger King restaurant in Miami. On Monday, April 2, 2012, Burger King launches 10 menu items including smoothies, frappes, specialty salads and snack wraps in a star-studded TV ad campaign. It's the biggest menu expansion since the chain opened its doors in 1954. (AP Photo/Luis M. Alvarez)

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The sun appears to be rising on Wendy's, which has surpassed Burger King as the second-biggest hamburger chain in the U.S. Both restaurant brands are reinventing themselves while struggling to keep up with the growth of McDonald's. (Associated Press)

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FILE - In this July 31, 2008 file photo, customers view the menu in the drive through line at a Burger King in Portland, Ore., Like it or not, many restaurant diners will soon know more about what they are eating under menu labeling requirements proposed Friday by the Food and Drug Administration. The requirements will force chain restaurants with 20 or more locations, along with bakeries, grocery stores, convenience stores and coffee chains, to clearly post the amount of calories in each item on menus, both in restaurants and drive-through lanes. The new rules will also apply to vending machines where calorie information isn't already visible on the package. (AP Photo/Don Ryan, File)