Tufts University published a new study in the January 2010 issue of the Journal of the American Dietetic Association finding that several restaurant chains and packaged-food manufacturers are underreporting the caloric content of their products. The study analyzed the caloric content of meals from national sit-down and fast-food chain restaurants and frozen meals purchased from supermarkets. Tufts researchers concluded that the caloric content information was, on average, 18 percent more than reported for the restaurant meals and, on average, 8 percent more than reported for packaged food. Because the sample population was small, however, researchers concluded that additional testing is required to assess whether underreporting is taking place on a national scale.