Victor Taleon

Whole maize flour could enhance food and nutrition security in Malawi

Maize is the staple cereal in Malawi, with a daily per capita consumption of 383 g (dry matter basis), primarily consumed in the form of nsima, a thick porridge. We combined a milling experiment with focus group discussions (FGDs) to provide insights into mass and nutrient losses during maize grain dehulling and maize flour consumption patterns in rural Malawi. Milling batches (30 kg) of four maize grain varieties were dehulled at three abrasive disk dehullers under controlled conditions. The impact of maize variety and dehuller design on mass and nutrient losses during dehulling was statistically significant (p < 0.05), with a mean mass loss of 28.1 ± 5.7%, and nutrient losses of 9.8 ± 1.9% for protein, 61.7 ± 2.0% for zinc, and 47.7 ± 3.6% for iron. Six FGDs conducted in rural areas of Lilongwe District revealed a preference for refined flour due to convenience and cultural norms, despite the nutritional benefits of whole grain flour, which was recognized for its ability to provide satiety, particularly during periods of maize scarcity. Participants also highlighted switching between flour types based on seasonal maize availability, social stigma associated with whole grain flour, and awareness of nutrient losses during dehulling. Given Malawi’s precarious food insecurity situation, transitioning from dehulled maize flour nsima to whole maize flour or less refined nsima, is imperative. Our study findings can have food and nutritional savings for other southern Africa countries where the dehulling is a common practice.

Rice milling and parboiling trade-offs for economic and nutritional gains with special attention to sub-Saharan Africa: A comprehensive review

Rice is an important source of calories and nutrients for people in low- and middle-income countries. In the quest to respond to consumer preferences and attract premium prices, paddy processors increase the degree of milling (polishing), largely affecting nutritional composition and economic value of milled rice. Milling and parboiling are crucial unit processing operations affecting the quality profile of rice. The literature poorly reports on milling and parboiling operations that provide economic and nutritional gains or losses. Thus, there are no standard milling and parboiling regimes recommended to influence technological and policy changes in favor of public health and nutrition. In this comprehensive review, rice milling and parboiling operations associated with nutritional, economic, food safety and environmental benefits have been presented and discussed. Optimal milling and parboiling strategies that provide nutritional, economic, food safety and environmental gains are proposed as alternatives to conventional processing technologies and practices. Improved parboiling and moderate degree of milling in two-stage systems appear to provide better economic and nutritional benefits.

Exploring rancidity in pearl millet flour: A lipidomic and biochemical approach