Adherence
Warning labels and traffic-light systems are equally effective in helping consumers identify the most healthful product among a set of options, outperforming the GDA system.
When comparing products, look for warning labels or traffic-light systems. Both help you quickly spot the healthiest option, whereas GDA labels (numbers/percentages) are harder to use for comparison. Choose the product with the fewest warnings or the most green lights.
Warnings and the traffic-light system performed equally well in the identification of the most healthful product.
Why this rating
Statistically significant difference between directive/semi-directive vs non-directive, with no significant difference between the two directive types.
Source
Warnings as a directive front-of-pack nutrition labelling scheme: comparison with the Guideline Daily Amount and traffic-light systems
Alejandra Arrúa et al. · Public Health Nutrition · 2017
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