报告主题：【人力资源发展与农业企业数据中心学术报告】Are Only-children More likely to Be Obesity?
报 告 人：田旭 南京农业大学教授
主 持 人：赵启然
田旭博士2013年毕业于德国哥廷根大学农业经济与农村发展系，现为南京农业大学经济管理学院教授、博士生导师。曾获江苏省333工程“中青年学术技术带头人”，江苏省“双创博士”、南京农业大学“钟山学术新秀”、南京农业大学“盛泉学者”等荣誉。主要研究食物消费与营养健康，经济发展与技术进步、农业生产转型等问题。曾在Food Policy, China Economic Review, Applied Economics, Economic Modeling, Canadian Journal of Agricultural Economics, Journal of Cleaner Production等SSCI/SCI期刊发表学术论文30余篇，在经济学季刊，中国农村经济、农业技术经济等中文期刊发表论文20余篇。主持或参与国家自科基金、国家社科基金多项；并担任国家自然科学基金、教育部学位中心通讯评审专家，以及Nature Food, World Development, Agricultural Economics, China Economic Review, Applied Economics，经济学季刊，中国农村经济等20余本中英文期刊匿名审稿人。
Family planning policy in China has resulted in a large number of one-child families. According to Becker’s “quantity-quality trade-off” theory there is an inverse relationship between the number of children in a family, and spending per child. We test whether this has led to significant differences in the height, weight and BMI of only-children compared with children with siblings in China using 4414 observations derived from four recent waves (2004, 2006, 2009, and 2011) of the China Health and Nutrition Survey. We use propensity score matching and instrumental variables to control for the possible endogeneity of the number of siblings. Results show that only-children are significantly heavier (1.88%-3.86%), and have higher BMI (2.59%-3.50%). Moreover, they are more likely to be obese than children with siblings (2.33%-3.00%). Further analysis shows that these differences in health outcomes might be attributable to higher consumption of animal-source food (23.90-27.13 g), a higher frequency of eating western fast food (0.48-0.70 times/3-month) and drinking sweetened soft drinks (0.29-0.36 times/month), a higher share of meals eaten away from home (4.67%-5.31%), and more sedentary activity (20.04-34.35 minutes/week) by only children. Our study indicates that the growing share of only children due to China’s family planning policies also contributes to the increasing prevalence of overweight and obesity in China. This policy has been eased in recent years, which might slow the increase in the prevalence of overweight and obesity and thus reduce the corresponding health burden for Chinese society as a whole.