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We use a statewide panel dataset and an instrumental variable strategy to identify the effect of neighborhood fast food on the BMI  z -scores of Arkansas public schoolchildren. As in earlier studies, we use distance from the child’s residence to the nearest major highway as an instrument for the density of fast-food restaurants. The sample is limited to children who moved at least once during the study period to ensure temporal variation in our instrument. Neighborhood fast food does have significant and positive effects on their BMI  z -scores. The effect is disproportionately large for children who are rural, non-minority and female.

The Effect of Neighborhood Fast Food on Children’s BMI: Evidence from a Sample of Movers