Is Diet Quality Improving? Distributional Changes in the United States, 1989-2008
Is Diet Quality Improving? Distributional Changes in the United States, 1989-2008
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DOI：
10.1093/ajae/aat104
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发表时间：
2014-04-01
影响因子：
4.2
通讯作者：
Smith, Travis A.
中科院分区：
文献类型：
--
作者：
Beatty, Timothy K. M.;Lin, Biing-Hwan;Smith, Travis A.
这篇文章测量了1989-2008年间美国成年人饮食质量分布的变化。饮食质量是对健康的直接投入，经常被用作福祉的代表，并且是各种经济干预措施的结果变量。就整个人口而言，我们发现各个层次的饮食质量都有显著改善。此外，我们发现低收入和高收入人群都有改善。构建膳食质量的反事实分布是为了调查观察到的改善在多大程度上可以归因于食物营养成分的变化和人口特征的变化。我们发现，所有成年人63%的改善可归因于食品配方和人口结构的变化。食品配方的改变在低收入人群（19.6%）与高收入人群（6.4%）的饮食改善中所占的比例要大得多。
This article measures changes in the distribution of dietary quality among adults in the United States over the period 1989-2008. Diet quality is a direct input to health, is often used as a proxy for well-being, and is an outcome variable for a wide variety of economic interventions. For the population as a whole, we find significant improvements across all levels of diet quality. Further, we find improvements for both low-income and higher-income individuals alike. Counterfactual distributions of dietary quality are constructed to investigate the extent to which observed improvements can be attributed to changes in the nutritional content of foods and to changes in population characteristics. We find that 63% of the improvement for all adults can be attributed to changes in food formulation and demographics. Changes in food formulation account for a substantially larger percentage of the dietary improvement within the lower-income population (19.6%) vs. the higher-income population (6.4%).