Junk Food in Schools and Childhood Obesity.
Junk Food in Schools and Childhood Obesity.
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DOI：
10.1002/pam.21602
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发表时间：
2012
影响因子：
3.8
通讯作者：
Nicosia, Nancy
中科院分区：
文献类型：
--
作者：
Datar, Ashlesha;Nicosia, Nancy
尽管经验证据有限，但人们越来越担心学校中垃圾食品的供应导致了儿童肥胖的流行。在本文中，我们估计垃圾食品的可用性对BMI，肥胖和相关结果之间的全国样本的五年级学生的影响。与以往的研究不同，我们通过控制儿童入学时的BMI和估计利用学校年级跨度变化的工具变量回归来解决学校食品环境的内分泌问题。我们的主要发现是，尽管在学校购买垃圾食品的可能性增加，但垃圾食品的供应并没有显着增加五年级队列中的BMI或肥胖。结果是强大的替代措施的垃圾食品的可用性，包括学校管理员报告的销售在上学时间，学校管理员报告的竞争力的食品店，和儿童的报告的垃圾食品的可用性。此外，对总体食物消耗和身体活动没有任何影响进一步支持BMI和肥胖的无效结果。
Despite limited empirical evidence, there is growing concern that junk food availability in schools has contributed to the childhood obesity epidemic. In this paper, we estimate the effects of junk food availability on BMI, obesity, and related outcomes among a national sample of fifth-graders. Unlike previous studies, we address the endogeneity of the school food environment by controlling for children’s BMI at school entry and estimating instrumental variables regressions that leverage variation in the school’s grade span. Our main finding is that junk food availability does not significantly increase BMI or obesity among this fifth grade cohort despite the increased likelihood of in-school junk food purchases. The results are robust to alternate measures of junk food availability including school administrator reports of sales during school hours, school administrator reports of competitive food outlets, and children’s reports of junk food availability. Moreover, the absence of any effects on overall food consumption and physical activity further support the null findings for BMI and obesity.
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