I exploit substantial increases in the earned income tax credit to study how a policy-driven change in family income affects childhood obesity. Using the National Longitudinal Survey of Youth 1979, my difference-in-differences estimates indicate that the probability of being obese increased by 3 percentage points among children whose families experienced a greater income shock. A further investigation suggests that a reduction in maternal time with children played a greater role in children's weight gain than income. The paper's finding shows that a program that is not designed for health purposes, such as earned income tax credit, can have unintended effects on health outcomes.
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