By: Rachael Rettner, Senior Writer
Published: 11/12/2013 07:42 AM EST on LiveScience
For people trying to wade though nutrition labels and choose healthy options, a front-of-package food label that boils down nutrition information to a single "score" may be the most user-friendly approach, a new study suggests.
In recent years, the fronts of some food packages have been decorated with short food labels, which are intended to briefly summarize a product's nutrition, and make unhealthy ingredients (such as high levels of saturated fat) highly visible to consumers.
However, there is currently no standard for what information needs to be on these labels, leading to a variety of front-of-package food labeling systems that may confuse consumers, said study researcher Christina A. Roberto, a psychologist and epidemiologist at the Harvard School of Public Health.
Experts say that a single, uniform food label should be adopted, but before this can happen, researchers need to know what works best. The new study attempted to help answer this question by comparing five front-of-package food labeling systems, as well as packages with no label. [12 Tips for Eating Healthy on a Budget]
More than 1,000 people, about half of whom were actively trying to lose weight, were randomly assigned to view food products with one of the following labels:
- A "Facts Up Front" label, which was created by the food industry and contains information about calories, saturated fat, sodium and sugars, as well as any noteworthy vitamins.
- A "NuVal" label, a proprietary labeling system that gives products a score from 1 to 100 based on a product's nutritional quality; higher scores denote healthier products.
- A single traffic light symbol, which is colored red, yellow or green based on the healthfulness of the product.
- A label depicting multiple "traffic lights," in which different nutrients get their own red/yellow/green symbol (such as green for saturated fat, but yellow for sodium).
- A star system, in which a product is given 0 to 3 stars based on its nutrition quality.
- No label
In a simulated online shopping task, participants viewed different soups, cereals, beverages, rice products and ice creams, and were asked to choose which products they would like to eat this week.
The only food labeling system that prompted people to pick healthier soups was the NuVal label, the study found.
When shown two products and asked, "Which is healthier?" the NuVal label, along with the multiple traffic-light label, worked best to help participants identify which product was truly healthier.
However, those who viewed the NuVal label were able to choose the healthier product in half the time as those who viewed the multiple traffic-light label, Roberto said.
Based on these preliminary data, NuVal is probably "the most user-friendly," Roberto said. The simplicity of the system (with just one number), and the fact that it allows users to compare products with high and low numbers, may be helpful to consumers, Roberto said.
However, much more research is needed to confirm the findings, including studies of "real-world" purchasing scenarios, Roberto said.
In addition, it's not clear how much front-of-package labels help consumers overall. In the study, the food labels did not help consumers pick healthier cereals, beverages, rice products or ice creams.
However, Roberto argues these labels have a purpose.
"It might not massively shift behavior, but I think it's still worth informing consumers," Roberto said. "It might influence behavior some of the time, and that can still have an important and meaningful public health impact."
And if front-of-package labels were mandatory -- as proposed in a recent congressional bill -- food companies may be pressured change their products so they are healthier (to get a higher NuVal score, or more "green" traffic lights, for instance).
If a uniform front-of-package label system is rolled out, consumers should be educated regarding how to interpret and use the labels, Roberto said.
The study was presented last week at the American Public Health Association meeting in Boston.