Mandatory menu labeling has arrived in Philadelphia, requiring chain restaurants to change their menus to list levels of fat, sodium and carbohydrates. Gary Foster, director of Temple's Center for Obesity Research and Education, says many diners won't be fazed by the new information but says "calorie-sensitive" people may make different food choices. "Some people won't care about calories, but they'll care about sodium. Some will care about sodium but won't care about cholesterol," he said.