Two-thirds of all participants in study underestimated the calorie content of their meals.

Restaurant chain's sales have climbed to $300 million in 2012 from $170 million in 2008.

Other changes to menu include Smart Fit salad and flavored coffee.

Interest especially strong for breakfast sandwiches.

Flatbreads available in three varieties: Margherita, Chipotle Chicken and California Grilled Chicken.

Research suggests menu labeling requirements should include independent restaurants and small chains.

Chain to tweak marketing efforts to regain lost value menu share.

Fourteen-year study shows only marginal gains being made in nutrition at leading fast-food chains.

New c.e.o. set to take reins in July.

Chain generated same-store sales growth, despite negative weather conditions and calendar impact.