Labeling rules for fast-food restaurant chains

Massachusetts approved the toughest statewide restaurant menu labeling rules in the United States on Wednesday, requiring major chain restaurants to display the calorie content of the food they sell.

The regulations, designed to combat rising obesity, are more comprehensive than those in California, which in September became the first state with menu labeling rules for fast-food restaurant chains such as McDonald's Corp and Yum Brands' KFC, advocates of healthy foods say.