4.2. Strengths
FOP
SHOP
This study utilized a randomized controlled trial design to experimentally test the effects of FOP labels when unexplained compared with when an explanatory video supplemented the labels, and compared both of these groups with a Control group that had access to neither labels nor the video, providing a test of the most likely scenarios when FOP labeling is introduced to a given market. This study balanced the control of a laboratory experiment with the ecological validity of choosing foods and beverages from a grocery/convenience store aisle by setting up aisles in a laboratory and equipping participants with a grocery basket as if they were shopping at a local store. By asking parents and children to shop together, ecological validity was further enhanced, nearly approaching the typical experience of food shopping experienced by individuals with children. Finally, participants knew in advance of selecting products that they would keep the chosen foods and beverages, enhancing the likelihood that they would choose products they preferred.