Food Security

Food security impacts of industrial crop production in sub-Saharan Africa: a systematic review of the impact mechanisms Abstract A number of industrial crops have been promoted in sub-Saharan Africa (SSA) to meet a range of policy objectives including economic growth, rural development, agricultural modernization and energy security. The food security impacts of industrial crop production have received extensive policyattention and have been widely discussed in the academic literature. There is, however, an overall lack of a clear understanding of these impacts due to thelarge diversity of industrial crops, and their varied modes of production, expansion areas, and impact mechanisms. This systematic review synthesizes theavailable knowledge on the interface of industrial crops and food security in SSA. In particular we identify key patterns with how different industrial cropsand impact mechanisms are represented and studied in the current literature, and how they intersect to affect food security. The current literature isfragmented, as most studies focus on single or small subsets of crops and impact mechanisms. Most studies capture mechanisms related to food access andavailability, rather than to food utilization and stability. A clustering analysis identified the main literature clusters that combine mechanisms related to foodavailability, access to food, and environmental impact. The overall analysis presented in this systematic review allowed us to identify priority policy andpractice domains that need to be targeted in order to improve the food security outcomes of industrial crop production in SSA.

The contribution of ‘chitoumou’, the edible caterpillar Cirina butyrospermi, to the food security of smallholder farmers in southwestern Burkina Faso Abstract Edible insects have been advocated as a means to combat food insecurity, which is prevalent in West Africa. In this study we look at the contribution of the shea caterpillar Cirina butyrospermi, colloquially known as ‘chitoumou’, to the food security of smallholder households in rural southwestern Burkina Faso. We used a mixed methods approach to understand the relationship between caterpillar collection, consumption, and sale by smallholder households, and their seasonal food security status. We found that caterpillars are an important source of food and income for households, significantly increasing the household consumption of animal protein and, with shea nuts, representing the main income source for the majority of women. We also found that food security is higher during caterpillar season, and that household-level food security during this season can be predicted by the amount of caterpillars collected, consumed and sold. However, this relationship holds only during the caterpillar season, suggesting that the positive impact of caterpillars on food security is temporally limited. We conclude that the shea caterpillar is an example of an edible insect that is crucial for seasonal food security in a widespread agricultural system.

Beyond the risks to food availability – linking climatic hazard vulnerability with the food access of delta-dwelling households Abstract Although climate-driven hazards have been widely implicated as a key threat to food security in the delta regions of the developing world, the empirical basis of this assertion has centred predominantly on the food availability dimension of food security. Little is known if climatic hazards could affect the food access of delta-resident households and who is likely to be at risk and why. We explored these questions by using the data from a sample of households resident within the Ganges-Brahmaputra-Meghna (GBM) delta in Bangladesh. We used an index-based analytical approach by drawing on the vulnerability and food security literature. We computed separate vulnerability indices for flood, cyclone, and riverbank erosion and assessed their effects on household food access through regression modelling. All three vulnerability types demonstrated significant negative effects on food access; however, only flood vulnerability could significantly reduce a household’s food access below an acceptable threshold. Households that were less dependent on natural resources for their livelihoods – including unskilled day labourers and grocery shop owners – were significantly more likely to have unacceptable level of food access due to floods. Adaptive capacity, measured as a function of household asset endowments, proved more important in explaining food access than the exposure-sensitivity to flood itself. Accordingly, we argue that improving food security in climatic hazard-prone areas of developing country deltas would require moving beyond agriculture or natural resources focus and promoting hazard-specific, all-inclusive and livelihood-focused asset-building interventions. We provide an example of a framework for such interventions and reflect on our analytical approach.

A model-based exploration of farm-household livelihood and nutrition indicators to guide nutrition-sensitive agriculture interventions Abstract Assessing progress towards healthier people, farms and landscapes through nutrition-sensitive agriculture (NSA) requires transdisciplinary methods with robust models and metrics. Farm-household models could facilitate disentangling the complex agriculture-nutrition nexus, by jointly assessing performance indicators on different farm system components such as farm productivity, farm environmental performance, household nutrition, and livelihoods. We, therefore, applied a farm-household model, FarmDESIGN, expanded to more comprehensively capture household nutrition and production diversity, diet diversity, and nutrient adequacy metrics. We estimated the potential contribution of an NSA intervention targeting the diversification of home gardens, aimed at reducing nutritional gaps and improving livelihoods in rural Vietnam. We addressed three central questions: (1) Do ‘Selected Crops’ (i.e. crops identified in a participatory process) in the intervention contribute to satisfying household dietary requirements?; (2) Does the adoption of Selected Crops contribute to improving household livelihoods (i.e. does it increase leisure time for non-earning activities as well as the dispensable budget)?; and (3) Do the proposed nutrition-related metrics estimate the contribution of home-garden diversification towards satisfying household dietary requirements? Results indicate trade-offs between nutrition and dispensable budget, with limited farm-household configurations leading to jointly improved nutrition and livelihoods. FarmDESIGN facilitated testing the robustness and limitations of commonly used metrics to monitor progress towards NSA. Results indicate that most of the production diversity metrics performed poorly at predicting desirable nutritional outcomes in this modelling study. This study demonstrates that farm-household models can facilitate anticipating the effect (positive or negative) of agricultural interventions on nutrition and the environment, identifying complementary interventions for significant and positive results and helping to foresee the trade-offs that farm-households could face. Furthermore, FarmDESIGN could contribute to identifying agreed-upon and robust metrics for measuring nutritional outcomes at the farm-household level, to allow comparability between contexts and NSA interventions.

Unravelling the variability and causes of smallholder maize yield gaps in Ethiopia Abstract Ethiopia has achieved the second highest maize yield in sub-Saharan Africa. Yet, farmers’ maize yields are still much lower than on-farm and on-station trial yields, and only ca. 20% of the estimated water-limited potential yield. This article provides a comprehensive national level analysis of the drivers of maize yields in Ethiopia, by decomposing yield gaps into efficiency, resource and technology components, and accounting for a broad set of detailed input and crop management choices. Stochastic frontier analysis was combined with concepts of production ecology to estimate and explain technically efficient yields, the efficiency yield gap and the resource yield gap. The technology yield gap was estimated based on water-limited potential yields from the Global Yield Gap Atlas. The relative magnitudes of the efficiency, resource and technology yield gaps differed across farming systems; they ranged from 15% (1.6 t/ha) to 21% (1.9 t/ha), 12% (1.3 t/ha) to 25% (2.3 t/ha) and 54% (4.8 t/ha) to 73% (7.8 t/ha), respectively. Factors that reduce the efficiency yield gap include: income from non-farm sources, value of productive assets, education and plot distance from home. The resource yield gap can be explained by sub-optimal input use, from a yield perspective. The technology yield gap comprised the largest share of the total yield gap, partly due to limited use of fertilizer and improved seeds. We conclude that targeted but integrated policy design and implementation is required to narrow the overall maize yield gap and improve food security.

Announcement

In this issue—December 2019

How important are supermarkets for the diets of the urban poor in Africa? Abstract Many developing countries are undergoing a profound transformation of food systems and retail environments. Especially in urban areas, a rapid growth of supermarkets is observed, which can affect consumer food choices and diets. Supermarkets may improve access to diverse foods at affordable prices, but may also encourage a switch from unprocessed to highly-processed and energy-dense foods that contribute to obesity. However, the use of supermarkets is positively correlated with income. That supermarkets already play an important role for the diets of many urban consumers does not necessarily mean that this is also true for the poorest population segments that are of particular interest for development policy. This article analyzes the diets and food purchase patterns of poor urban consumers in Kenya and Uganda. Representative data were collected from households in the slums of Nairobi and Kampala. The data show that the majority of these households are undernourished. They buy most food items in unprocessed form from various traditional retail outlets, including mom-and-pop shops, local markets, and kiosks. Relatively few sample households buy any of their food in supermarkets. Supermarkets account for only 3% and 0.4% of all food expenditures of slum dwellers in Nairobi and Kampala, respectively. Reasons for the low supermarket use of these poor households are discussed. The findings suggest that a focus on the modern retail sector alone will not suffice to ensure food and nutrition security for all.

In search of alternative proteins: unlocking the potential of underutilized tropical legumes Abstract Protein is one of the essential nutrients required for almost every task of a human’s cellular life. Severe protein malnutrition, which can cause a fatal outcome, is the leading cause of death for infants and children in many African and Asian countries that have little to no access to complete proteins. Complete proteins, which contain all nine amino acids essential for human health, are usually found in animal-based foods such as meat and dairy products. The overconsumption of animal-based proteins, however, can potentially increase the risk of diet-related chronic diseases. Recent years have witnessed enhanced awareness about the health benefits of substituting animal-based proteins with plant-based proteins, especially in developed countries. Nitrogen-fixing grain legumes are considered important sources of protein in many developing countries because they are generally cheaper than meat or cereals. Extensive research has been conducted on several well-known legumes, notably soybean, which is the most economically important legume worldwide. Nevertheless, many lesser-known legumes with similar nutritional properties to soybean are still underdeveloped, including winged bean, lentil, lima bean, lablab, and bambara groundnut, which are commonly grown in the tropics. Only now are these species receiving more scientific attention. This review highlights the potential of these tropical legumes as future major sources of plant-based proteins, along with the critical research areas for their improvement. We provide insights into how these underutilized legumes could help resolve the global protein crisis and address food insecurity issues.

Adaptation to climate change and climate variability and its implications for household food security in Kenya Abstract Climate change and climate variability affect weather patterns and cause shifts in seasons with serious repercussions such as declining food production and productivity for communities and households in Kenya. To mitigate the negative impacts of climate change and variability, farming households have been encouraged to adopt different strategies such as new crop varieties, crop and livestock diversification, and water-harvesting technologies. These adaptation strategies are expected to boost both the amount of food produced and food security of an adapting household; which in this case is defined one that has taken up one or more of the twenty-five climate change and climate variability adaptation techniques identified during the study. Using maize yield equivalent (MYE), which expresses farm production in equivalent kgs of maize grain, as a measure of total crop production and food security, this study assessed the factors influencing adaptation to climate change and climate variability, and the implications of adaptation for food security. To accomplish these objectives, an endogenous switching regression model was applied to household survey data of 658 households from 38 counties in Kenya. The results demonstrated that increases in mean air temperature and precipitation influenced levels of food production either negatively or positively depending on whether they occur at harvest, land preparation or during crop growing periods. The type of soil also influenced productivity as households living in areas with different soil types produce varying quantities of MYE in kgs/ha of land. Household characteristics and ownership of farm assets also influenced adaptation. By comparing production of adapting and non-adapting households, we demonstrated that households adapting to climate change and climate variability through uptake of technologies such as early planting, use of improved crop varieties, and crop diversification produced 4877 kgs of MYE/ha per year against 3238 kgs of MYE/ha per year for households that did not adapt (a 33.6% difference between the two groups). Given the nature of for smallscale households who produce mainly for household consumption, high crop yields translate to increased food security. We can therefore conclude that successful adaptation to climate change and climate variability significantly increases food security in Kenya.