Measuring changes in diet deprivation: New indicators and methods
提出参考饮食剥夺指数（ReDD），从家庭消费调查数据衡量饮食剥夺的发生率、广度和深度，并结合经济模型分析政策或外部冲击对饮食质量的影响。尼日利亚案例表明，乳制品、豆类坚果、水果和红肉价值链的生产率增长比主粮更能减少饮食剥夺。
Improving diet quality is an emerging development policy priority. Existing indicators emphasize the cost and affordability of healthy diets but have not attempted to measure how far households are from ideal diets or how policies may nudge them closer to them. We propose a new Reference Diet Deprivation (ReDD) index, estimated from household consumption survey data, that measures the incidence, breadth, and depth of diet deprivation across multiple food groups. While informative as a standalone measure, we demonstrate how the ReDD index can be integrated into an economic model to examine changes in diet quality under different policy or external shocks. Our Nigerian case study shows that productivity growth in the dairy, pulse & nut, fruit, and red meat value chains have more potential than staple crops to reduce diet deprivation. While these findings have implications for food and agricultural policy prioritization in Nigeria, the study more importantly demonstrates the usefulness of the ReDD index for assessing diet quality and examining the drivers of dietary change when used in conjunction with a simulation model.