During the study, participants were given a variety of yogurts that differed in sugar and fat quantity. Even when they were given information about the ingredients, this was not sufficient to encourage people to choose the healthier yogurt. This strategy was especially ineffective for people who needed it most, because the least health-conscious people were also the least likely to take any new health information into consideration.
Even though some health-conscious people modified their behavior slightly when given better information on the product, both the informed and uninformed unhealthy people expressed firm opinions that the less healthy yogurts were tastier. It was this tastiness factor that, in the end, drove the decision-making for both healthy and unhealthy people, and it could not be overcome simply by raising health consciousness.
The study has been published in the Journal of Public Policy and Marketing.