TY - JOUR T1 - Expanding Exposure JF - Journal of Human Resources JO - J Hum Resour SP - 373 LP - 402 DO - 10.3368/jhr.46.2.373 VL - 46 IS - 2 AU - David E. Frisvold AU - Julie C. Lumeng Y1 - 2011/03/31 UR - http://jhr.uwpress.org/content/46/2/373.abstract N2 - Coinciding with the work requirements of welfare reform in the mid-1990s, the early childhood education program, Head Start, significantly expanded to increase the availability of full-day classes. Using unique administrative data, we examine the effect of full-day compared to half-day attendance on childhood obesity. This effect is identified from changes in obesity over time and from the elimination of a state-provided full-day expansion grant that decreased the supply of full-day classes. Our results suggest that full-day Head Start attendance significantly reduces the proportion of obese children at the end of the academic year. ER -