Migration and child development during the food price crisis in El Salvador

Migration is often used as parts of both ex post and ex ante strategies to mitigate risks to household incomes. There is little empirical evidence, however, of the way that migration actually helps households in times of shocks. In this paper, I describe how the peak of the worldwide food price crisis affected anthropometric statistics among young children in El Salvador, and how households with access to international migrants were not affected as negatively as households without such access. In 2008, El Salvador experienced food price inflation of 15%, and the evaluation of Red Solidaria, El Salvador’s conditional cash transfer program, shows that height-for-age (HAZ) Z scores among children under 3 years old declined by 0.2 standard deviations on average. In this paper, I use the Red Solidaria evaluation data to assess whether children in households with access to remittances or international migrants were better off than households without access to migration income. Using both repeated cross-sectional data and individual panel data, I find that as theory would expect, children in households with access to international migrants have much lower declines in their HAZ scores.     

What happens to diet and child health when migration splits households? Evidence from a migration lottery program

The impact of migration on food security and child health is likely to differ depending on whether children themselves migrate or whether they remain behind while other household members migrate. However, existing studies have not been able to examine how impacts differ in these two scenarios because parallel data are required for both the sending and receiving country. Moreover, self-selection into migration makes unbiased estimation of either impact difficult. We overcome these problems by using a unique survey of Tongan households that applied to migrate to New Zealand through a migrant quota which selects households through a random ballot. This survey covers both migrant children in New Zealand and non-migrant children in Tonga, with the migration policy rules providing a source of exogenous variation for identifying impacts. Our estimates of short-run impacts show that diets diverge upon migration: children who migrate experience improvements, while diets worsen for children who remain. There is also suggestive evidence of a divergence in health outcomes, with increases in weight-for-age and height-for-age found for migrant children, and decreases found for children who remain behind while other household members migrate.     

The Intergenerational Transmission of "Intelligence": Down the Slippery Slopes of The Bell Curve

Herrnstein and Murray report that conditional on maternal "intelligence" (AFQT scores), child test scores are little affected by variations in socioeconomic status. Using the same data, we demonstrate that their finding is very fragile. We explore the effect of adopting a more representative sample of children, including blacks and Latinos, allowing nonlinearities in the relationships, and incorporating richer measures of socioeconomic status. Making any one of these changes overturns their finding: Socioeconomic status and child test scores are positively ad significantly related. Evidence is presented suggesting AFQT scores are likely better markers for family background than "intelligence."     

Vulnerability to stunting in the West African Sahel

This paper presents a simple simulation framework for understanding and analyzing vulnerability to stunting. We utilize Demographic and Health Surveys merged with satellite data on climatic shocks. Children aged 0–5 years are grouped into three categories: consistently stunted, vulnerable, and non-vulnerable. The first group constitutes those who are stunted and will also be stunted in any hypothetical period. Non-vulnerable are those whose likelihood to be stunted is zero. The vulnerable face a probability between 0 and 1 of being stunted. The probability is calculated as the share of years in which the child would be stunted, given the village level distribution of weather shocks over the period 2000–2013. We provide estimates of vulnerability to stunting in Burkina Faso, Northern Ghana, Mali, Northern Nigeria, and Senegal by aggregating over villages, districts and countries.     

International migration and nutritional outcomes in Tajikistan

Tajikistan is the country with the largest share of remittances to GDP in the world. At the same time it suffers from stubbornly high levels of child malnutrition against which only very slow progress has been made. This paper investigates the relationship between international migration and child malnutrition, using data from a recent nationally representative household survey. There are theoretical reasons to expect that migration may be exerting both positive and negative effects on nutrition and food security, so that understanding what the net effect may be is essentially an empirical question. Our results indicate that migration appears to be playing a positive role in enhancing child growth patterns (as measured by height-for-age z-scores) in the country. We explore some of the possible channels through which this effect might be operating and find that one such channel is by increasing households’ kilocalorie consumption.     

Migration and the overweight and underweight status of children in rural China

The rapid economic growth in China is accompanied by a large scale rural-to-urban migration, but over time more children are left behind rural areas. This paper studies how the overweight and underweight status of the rural children is associated with the out migration of others in their household. We find that migration is related to different nutritional outcomes for the left-behind children. The older children (aged 7–12) are more likely to be underweight; the younger (aged 2–6) are less likely to be overweight if left behind without the care of a grandparent. We also find evidence that the remaining adult household members spent less time preparing meals, whereas older children take up more household chores.     

First foods: Diet quality among infants aged 6–23 months in 42 countries

Diet quality is closely linked to child growth and development, especially among infants aged 6–23 months who need to complement breastmilk with the gradual introduction of nutrient-rich solid foods. This paper links Demographic and Health Survey data on infant feeding to household and environmental factors for 76,641 children in 42 low- and middle-income countries surveyed in 2006–2013, providing novel stylized facts about diets in early childhood. Multivariate regressions examine the associations of household socioeconomic characteristics and community level indicators of climate and infrastructure with dietary diversity scores (DDS). Results show strong support for an infant-feeding version of Bennett's Law, as wealthier households introduce more diverse foods at earlier ages, with additional positive effects of parental education, local infrastructure and more temperate agro-climatic conditions. Associations with consumption of specific nutrient-dense foods are less consistent. Our findings imply that while income growth is indeed an important driver of diversification, there are strong grounds to also invest heavily in women’s education and food environments to improve diet quality, while addressing the impacts of climate change on livelihoods and food systems. These results reveal systematic patterns in how first foods vary across developing countries, pointing to new opportunities for research towards nutrition-smart policies to improve children’s diets.     

Explaining the reduction in child undernutrition in the Indian state of Maharashtra between 2006 and 2012: An analysis of the policy processes

The Indian state of Maharashtra has been lauded as a ‘success story’ for its rapid and significant decline in undernutrition amongst children. Between 2006 and 2012, childhood stunting fell from 39 to 24%. Whilst the global policy and academic literature strongly emphasises the need to act on nutrition, there are still too few studies outlining the policy processes which been part of successful state-led strategies – particularly at a sub-national level. This study is intended to contribute to future policy via unpacking the unfolding story of policy and programme attention to nutrition. Stakeholder perceptions and opinions on the wider policy, political and contextual reasons for Maharashtra’s decline in child undernutrition were sought and used alongside documentary evidence to construct a chronology of key events. Key factors identified via this process include the way in which issue framing and evidence helped catalyse a political response; the particular governance structures employed in response (the State’s ‘Nutrition Mission’) and the way in which leadership and a focus on system-wide capacity combined in an innovative fashion to focus resources on pockets of deprivation in high-burden areas.     

Impact of off-farm income on food security and nutrition in Nigeria

While the poverty implications of off-farm income have been analyzed in different developing countries, much less is known about the impact of off-farm income on household food security and nutrition. Here, this research gap is addressed by using farm survey data from Nigeria. Econometric analyses are employed to examine the mechanisms through which off-farm income affects household calorie and micronutrient supply, dietary quality, and child anthropometry. We find that off-farm income has a positive net effect on food security and nutrition. The prevalence of child stunting, underweight, and wasting is lower in households with off-farm income than in households without. Using a structural model, we also show that off-farm income contributes to higher food production and farm income by easing capital constraints, thus improving household welfare in multiple ways.     

Endemic malaria,malnutrition and child deaths

Past failures of nutrition programs could lead to disillusionment among governments with nutritionists unless realistic targets are adopted. High child death rates are due to both infection and malnutrition, both causes of high general fertility rates. A nutrition program in Zambia examined malarial infections and undernutrition as causes of death. Where malnutrition was diagnosed in youngest children, significantly more siblings had died. However, positive malaria in the youngest child was associated with most sibling deaths; rates being always higher among children where it was detected. A reduction in malaria transmission is proposed as a more effective policy than that of increasing general food production. This would reduce death rates and population growth and increase the availability of family resources for each child.     

Does Homeownership Affect Child Outcomes?

We study the impact of homeowning on the cognitive and behavioral outcomes of children. Using four waves of a comprehensive national panel data set, we control for many social, demographic and economic variables previously found to influence child outcomes. The data are a panel, allowing us to control for unobserved household– and child–specific factors. We use a treatment effects model to address the issue of possible sample selection bias caused by unobserved variables that influence both the parent's choice of whether to own or rent and whether to invest in their children. We find that owning a home compared with renting leads to a 13 to 23% higher quality home environment, greater cognitive ability and fewer child behavior problems. For children living in owned homes, math achievement is up to 9% higher, reading achievement is up to 7% higher, and children's behavioral problems are 1 to 3% lower.     

Vertical transmission of overweight: Evidence from a sample of English adoptees

Vertical influences can significantly shape children overweight by affecting both genetics and the environment children are exposed to. This paper examines the vertical (parental) transmission of child overweight drawing upon a fifteen year sample of English adults and their children, both adopted and biological, for which we can retrieve clinical measures height and weight. We find that, when both parents are overweight, children exhibit an increased likelihood of overweight, irrespective of whether they are adopted or biological children. When both parents are obese as opposed to overweight the picture is different. We find that the likelihood of child overweight increases by 16.7 percentage points among natural (non-adopted) children but only by 4.5 percentage points among adopted children. This suggests that the transmission of overweight when both parents are obese is not merely genetic, and what has been called vertical or parental transmission plays a non-negligible role. Our findings are validated by are a battery of robustness checks.     

Galvanizing political commitment in the UN Decade of Action for Nutrition: Assessing commitment in member-countries of the Scaling Up Nutrition (SUN) Movement

In pursuit of the global ambition of ending all forms of malnutrition, it is important to understand, measure and strengthen political commitment for nutrition. Building commitment involves advocating, establishing institutions, adopting policies, mobilizing resources and coordinating responses – within and outside of government, across sectors, from national to local levels – for as long as necessary to ensure results, sustained over time. As the Scaling Up Nutrition (SUN) Movement enters its tenth year of existence, this study asks if political commitment for nutrition is evident in the 60 SUN member countries and how this commitment translates into results.Guided by a theoretical framework, we use indicators from the SUN Movement's Monitoring, Evaluation, Accountability and Learning (MEAL) system to measure five forms of political commitment for nutrition - expressed, institutional, operational, embedded and system-wide - in countries stratified by income and duration of SUN membership. We further determine the association between assessed levels of commitment and progress towards achieving established global nutrition targets. In doing so, we identity important commitment gaps.Results show that countries that joined the SUN Movement early (2010–12) had higher expressed and institutional commitment scores compared with late joiners (2013–17), with no difference between low and middle-income countries. For operational commitment, early joiners had higher scores for the finance and legislation subcomponents but not for nutrition-specific intervention coverage. Low-income countries, however, had significantly lower scores for the nutrition-specific intervention coverage sub-component of operational commitment and lower embedded commitment scores compared with middle-income countries. A positive association was found between institutional and operational commitment, irrespective of country economic status. Early joiners in the SUN Movement were more likely to rank in the top half of SUN countries for all four forms of commitment. When divided into terciles based on their overall rank for system-wide political commitment, countries in the highest tercile were more likely to be making progress in the reduction of U5 child stunting.The results point to the importance of working to strengthen all forms of commitment, especially converting expressed and institutional commitments into operational commitment. While institutional commitment matters, it can be ‘tokenistic’ only if there is limited capacity to operationalise that commitment. Countries with system-wide political commitment appear to achieve better nutrition impact. It is difficult to determine whether early joiners were already more committed to nutrition and therefore more likely to join the SUN Movement or whether membership in the SUN Movement compelled such commitment. Most likely it is a combination of both, but it is hard to disentangle the direction of causality without measuring changes in commitments over time, and complementing this type of analysis with qualitative research on the perspectives of different stakeholders. Nonetheless, the ongoing measurement and reporting of political commitment can inform dialogue with country and global-level stakeholders on how to galvanize further commitment during the UN Decade of Action on Nutrition especially in view of the 2020 Nutrition for Growth (N4G) Summit in Tokyo, Japan.     

A meta-analysis of community-based studies on quality protein maize

Biofortification, or the improvement of nutritional quality in food crops, is a promising strategy to combat undernutrition, particularly among the rural poor in developing countries. However, traditional methods of impact assessment are inadequate for biofortified crops, as they do not consider their nutritional benefits. Evidence for the nutritional impact of maize varieties with improved protein quality, collectively known as quality protein maize (QPM), was evaluated using meta-analysis of randomized, controlled studies in target communities. A new and generalizable effect size was proposed to quantify the impact of QPM on a key outcome, child growth. The results indicated that consumption of QPM instead of conventional maize leads to a 12% (95% CI: 7–18%) increase in the rate of growth in weight and a 9% (95% CI: 6–15%) increase in the rate of growth in height in infants and young children with mild to moderate undernutrition from populations in which maize is the major staple food. The proposed effect size and use of bootstrapping to determine statistical significance addressed some methodological limitations in the existing studies.     

The politics of success in the fight against malnutrition in Peru

The dramatic reduction in children’s chronic malnutrition in Peru observed in recent years has defied the patterns of stunting reduction worldwide. After nearly a decade of stalled progress, the government reported a reduction in stunting rates of nearly 10 points, from 29.8% in 2005 to 18.1% in 2011. The specialized literature has acknowledged the critical role that immediate (e.g. increasing breastfeeding promotion) and underlying (e.g. investments to improve household food security) interventions have played in reducing stunting (Black et al., 2013), as well as the contributing role of enabling factors related to economic performance. This paper offers an alternative explanation to success by looking at the shift in the government’s nutrition strategy after 2006 with the formation of the Child Malnutrition Initiative (CMI), a civil society working platform, and the adoption of a national poverty reduction strategy prioritizing nutrition interventions (known as CRECER) and conditional cash transfers (JUNTOS). The paper uses veto players theory to explain how these changes effectively contributed to policy change by reducing the effective number of nutrition stakeholders involved and facilitating policy agreements around a common policy platform and established goals. The Peruvian case also highlights the importance of the government’s public commitment to reduce chronic malnutrition in children under five by 5 percent in 5 years (“5 by 5 by 5”) and the accompanying role, advocacy and monitoring from civil society organizations.The paper looks at the success of implementing the nutrition strategy in three dimensions. Horizontally, it looks at the coordination between government and non-government agencies to converge around a common policy discourse;vertically, it looks at the implementation of the nutrition strategy across national, regional and municipal governments;and financially, it looks at the coordinated and conditional allocation of nutrition funding and how this created greater incentives for horizontal and vertical coordination. The paper draws some theoretical and policy implications for improving the effective and accountable delivery of nutrition interventions in Peru and other countries outside Latin America.     

焊接条件对高强钢HAZ断口形貌的影响

本文应用插销试验法研究了焊接条件——钢材种类、扩散氢含量、预热温度和后热温度对航空常用三种高强钢30CrMnSiA、30CrMnSiNi2A和40CrMnSi MOV HAZ 冷裂倾向的影响,并通过断口扫描分析探讨了焊接条件对 HAZ 断口形貌的影响。试验证明,焊接条件改变,HAZ 的冷裂倾向和断口形貌均发生较大的变化。     

Differences in food insecurity between adults and children in Zimbabwe

Food insecurity is a serious challenge facing millions of households across Africa. Within these households, distinguishing the incidence of food insecurity between adults and children is often difficult because most surveys rely on the reports of adults. In this paper, we address this shortcoming of previous work by using a survey from over 6000 households in Zimbabwe where interviews were conducted with both an adult caregiver and a child. Using two measures of food insecurity, we find that reports of adults and children differ within households with lower reports of food insecurity among children, with children in the youngest age groups particularly being protected from food shortages. An exception to this general rule, though, is in better-off households where children are often more likely to be food insecure than adults. Findings also demonstrate the need for multiple measures to comprehensively capture the full picture of food insecurity in the household.     

The value of PL 480: A fresh look at PL 480, Title II

The main purpose of US Public Law 480 is to make food available to deficit countries on concessional or credit terms by using domestic US agricultural surpluses. Food aid under Title I is intended to provide a resource transfer to resource-poor countries; Title II (Food for Peace) shipments are intended for famine relief, the alleviation of malnutrition, and are generally targeted at the neediest people, especially children, in poor countries. Under Title III, sales proceeds are earmarked for programmes for agricultural development. The following three articles illustrate differing beliefs held about the effectiveness of PL 480 food aid, and particularly the value of Food for Peace. Table 1 shows the total shipments and budgeted acquisitions under Title II.