2.2. Randomization and Masking
Participants were randomly assigned to one of the two groups (intervention or control) in a 1:1 ratio, and a diet selection survey was conducted in a double-blind manner so that participants and the interventionists, who were also the data analysts of the present study, could not discriminate between the groups of participants. Notably, randomization was performed using the permuted block method with a block size of 2. After being classified into two groups, participants were emailed a URL to a Google Forms survey in which they had to choose a meal based on whether they had a TLF label. The blinding was maintained until the end of the statistical analysis, with the participants responding independently to the URLs sent to them without discussing the contents of the survey.