Objective: To evaluate the microfoundations of a personality-inspired public health campaign's influence on minors.
Design: Multi-year randomized control trial.
Setting: Economics professor's front porch in New Haven, CT.
Participants: 1223 trick-or-treaters in New Haven over three years; on average, 8.5 years old and 53% male (among children whose gender was identifiable).
Eligibility: Trick-or-treaters over the age of three that approached the house.
Intervention: Random assignment to the Michelle Obama side of the porch or the Comparison side of the porch.
Main outcome measure: Selection of fruit over candy.
Methods: Difference-in-means estimates.
Results: We estimate that viewing a photograph of Michelle Obama's face relative to control conditions caused children to be 19% more likely to choose fruit over candy.
Conclusions: Michelle Obama's initiative to reduce childhood obesity has influenced children's dietary preferences. Whether this influence extends beyond Halloween trick-or-treating in New Haven, CT on the porch of an economics professor requires further research.