Calorie data on fast-food chain restaurant menus may well meet federal labeling requirements but don't serve the purpose at helping consumers who are attempting to make healthy meal choices, claims a new study.
Elizabeth Gross Cohn and her colleagues from the Columbia University School of Nursing (CUSON) studied the calorie counts for 200 food items on menu boards in fast-food chain restaurants in the New York inner-city neighbourhood of Harlem.
Since 2006, the City has had a standard menu labelling law that includes some, though not all, of the new federal requirements.
"Although most postings were legally compliant, they did not demonstrate utility," the authors said.
"Menu postings for individual servings are easily understood, but complex math skills are needed to interpret meals designed to serve more than one person. In some items, calories doubled depending on flavour, and the calorie posting did not give enough information to make healthier selections," they said.
The federal health reform law passed in March 2010 requires restaurants with 20 or more locations to provide calorie data and additional nutritional information for menu items and self-service foods.
The Food and Drug Administration is now considering how best to guide chain restaurants in posting calorie counts on menu boards.
Easily understood calorie listings could be helpful to consumers trying to make healthy food choices, especially in light of the increasing prevalence of obesity among American adults and children.
The trend is a particular problem in low-income and inner-city neighbourhoods, where sources of more healthful foods might not be as common as fast-food fare.
Studies suggest that consumers are generally unaware of, or inaccurately estimate, the number of calories in restaurant foods.
To collect the data, volunteers equipped with digital cameras worked in pairs and canvassed each designated area block by block to identify national restaurant outlets.
A total of 70 menus and menu boards from 12 restaurant chains were photographed, and 200 food items rated, using a measure of "practical utility" that the researchers developed to calculate what constitutes a single serving and the number of calories in a single serving.
They then combined this measure with current FDA guidelines to develop a seven-item "menu rating tool".
The researchers found that, while most restaurants studied have posted calorie counts, in the majority of cases there was insufficient information to make use of them at the point of purchase.
One reason for this was that the majority of the items on the menu boards studied were combination meals rather than individual items. Furthermore, it was increasingly difficult to calculate calories per meal when the posting included anything more than an individual unit of measure.
Calorie counts became more challenging as the food items became more complex, especially combination and multi-serving items, which represented the largest percentage of items recorded.
These required several mathematical and nutritional calculations, which might be more challenging among low socioeconomic groups in urban areas where fast-food chain restaurants tend to be most concentrated.
The authors noted that their study was limited to one urban community and did not focus on actual food purchasing behaviour but rather on the posted menu boards in chain restaurants. Still, they say, their work suggests the need for more understandable and useful calorie information in posted menus.
"As further legislation is developed, we support the FDA in their commitment to having menu boards that are useful at all levels of literacy.
"In low-income communities with a high density of chain restaurants, and where educational attainment of consumers may be low, simplifying calorie postings and minimizing the math required to calculate calories would increase menu board utility," they added.
The study has been published online in the Journal of Urban Health.