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A potential relationship yet overlooked could run from providing the proper environment for healthy lifestyles to reduced weight problems. A unique quasi\u2010experimental setting of transforming former airport grounds to a large urban green space allows me to apply a difference\u2010in\u2010differences approach within an intention\u2010to\u2010treat framework, comparing several weight outcomes of residential children to children living further away before and after park opening. I use new administrative data on the Berlin district level from mandatory school entrance examinations and provide robust evidence of a lower probability by 4.3% points for treated children to be overweight (BMI\u00a0&gt;\u00a090 P.), driven entirely by girls, mainly by children from foreign cultural backgrounds and children with less childcare exposure. 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