Project report
The dynamics of nutrition and child health stocks
Matthias Rieger, Natascha Wagner ·
Summary
Written by AI, not yet AICS's view · claude-haiku-4-5-20251001This research examines how children's height and weight develop together over time, using data from 305 Senegalese children aged 0-5 years. The study finds that a child's health status improves the effectiveness of nutrition inputs, and that health improvements fade quickly without continued support. Simulations show that nutritional benefits from infancy are largely lost by age 2, suggesting that nutrition programs need to be sustained long-term to have lasting effects.
Key points
- Child health stocks are self-productive and create dynamic complementarity with nutrition inputs
- Health produced at one stage raises the productivity of nutritional inputs at subsequent stages
- Child health is quickly depleted and requires constant updating
- A positive nutritional shock in the first six months of life is mostly depleted by age 2
- Long-term nutrition programs yield higher returns when targeting babies in early infancy
Limitations
The study is based on a relatively small panel of 305 children from Senegal only, which may limit generalizability to other contexts. The document does not provide detailed information about the specific nutrition interventions tested or their implementation context.
Abstract
Height-for-age (HA) and weight-for-age (WA) of children are standard measures to study the determinants of stunting and short-term underweight. Rather than studying these indicators separately, this paper looks at their interaction and therefore at the dynamics of height and weight. Considering HA a child's health stock and WA nutritional investment, we develop an overlapping generations model. The main features of the model are self-productivity of health stocks and the dynamic complementarity between past health stocks and contemporaneous nutrition. We test the model's predictions on a Senegalese panel of 305 children between 0 and 5 years over three periods. To control for endogeneity and serial correlation we employ different GMM methods. We find evidence of self- productive health stocks and that child health produced at one stage raises the productivity of nutritional inputs at subsequent stages. Our results indicate that child health is quickly depleted and needs constant updating. Simulations based on our estimates show that a positive nutritional shock during the first six months of life is essentially depleted at the age of 2. Consequently, sustainable development and nutrition programs have to be long-term and yield higher returns if they reach babies in the early months of infancy.