Contribution of edible insects to improved food and nutrition security:a review

The consumption of insects “entomophagy” or insect-based foods is increasingly being recognised as an emerging solution to promote diet diversification and address the multiple burden of malnutrition. Although several studies suggest edible insects as valuable nutrient sources, few have evaluated the effects of processing on nutrient bioavailability and bioaccessibility and provided actual evidence on human nutrition. Moreover, there is limited evidence of their actual contribution to improved food and nutrition security. Therefore, the review evaluated existing evidence on human interventions and the effects of processing methods on bioavailability and bioaccessibility of key nutrients since these directly influence food and nutrition security outcomes. Seven human efficacy studies have been conducted to date and these show limited observable effects on nutrition status therefore more research is required. Findings also suggest that the processing method, insect matrix, composition of the food matrix and interaction with other food components can influence nutrient bioavailability and bioaccessibility. Hence, these should be considered during formulation and upscaling for entomophagy and insect-based foods to be viable intervention strategies against malnutrition.</p

Mopane worm value chain in Zimbabwe:evidence on knowledge, practices and processes in Gwanda district

Consumption of edible insects is a potential solution to the growing need for protein. However, the wild harvested edible insects’ value chain faces several challenges including limited knowledge on indigenous practices in the harvesting and processing and lack of information on roles of the different actors in the chain. A case study of Gonimbrasia belina, colloquially referred to as the ’mopane worm’, was conducted to understand and identify determinants of participation in the value chain of the edible caterpillar. A cross sectional study was conducted in Gwanda (a rural district in Zimbabwe) to (a) understand the indigenous knowledge on harvesting and processing methods, (b) explore value addition and the traditional beliefs surrounding the utilisation of the mopane worm. Results showed that consumers (81.7%), and harvesters (76.6%) were the main actors in the mopane worm value chain. Using the Ordinary Least Squares (OLS) model, the following were shown to be determinants of participation in the mopane worm value chain: (a) gender (b) household size (c) marital status (d) religion and (e) household assets. Two primary processing methods of harvested mopane worm were distinguished i.e., boiling and roasting on ambers. Results showed lack of diversity in mopane worm-based products. Current culturally acceptable processing techniques need improvement and standardization to support sustainable mopane worm processing while optimising nutrient bio-accessibility

Anemia in children aged 6–59 months was significantly associated with maternal anemia status in rural Zimbabwe.

Globally, anemia is a public health problem affecting mostly women of reproductive age (WRA, n = 452) and children aged 6–59 months (n = 452) from low- and lower-middle-income countries. This cross-sectional study assessed the prevalence and determinants of anemia in WRA and children aged 6–59 months in rural Zimbabwe. The venous blood sample was measured for hemoglobin utilizing a HemoCue machine. Anthropometric indices were assessed and classified based on World Health Organization standards. Socioeconomic characteristics were assessed. The median (±inter quartile range (IQR)) age of WRA was 29 ± 12 years and that for children was 29 ± 14 months. The prevalence of anemia was 29.6% and 17.9% in children and WRA, respectively, while the median (±IQR) hemoglobin levels were 13.4 ± 1.8 and 11.7 ± 1.5 g/dl among women and children, respectively. Multiple logistic regression analysis was used to assess determinants of anemia. Anemia in children was significantly associated with maternal anemia (odds ratio (OR) = 2.02; 95% CI 1.21–3.37; p =.007) and being a boy (OR = 0.63; 95% CI 0.41–0.95; p =.029), while anemia in WRA was significantly associated with the use of unimproved dug wells as a source of drinking water (OR = 0.36; 95% CI 0.20–0.66; p =.001) and lack of agricultural land ownership (OR = 0.51; 95% CI 0.31–0.85; p =.009). Anemia is a public health problem in the study setting. The positive association between maternal and child anemia reflects the possibility of cross-generational anemia. Therefore, interventions that focus on improving preconceptual and maternal nutritional status may help to reduce anemia in low-income settings

Urine Se concentration poorly predicts plasma Se concentration at sub-district scales in Zimbabwe, limiting its value as a biomarker of population Se status

Introduction: The current study investigated the value of urine selenium (Se) concentration as a biomarker of population Se status in rural sub-Saharan Africa. Method: Urine and plasma Se concentrations were measured among children aged 6–59 months (n = 608) and women of reproductive age (WRA, n = 781) living in rural Zimbabwe (Murehwa, Shamva, and Mutasa districts) and participating in a pilot national micronutrient survey. Selenium concentrations were measured by inductively coupled plasma-mass spectrometry (ICP-MS), and urine concentrations were corrected for hydration status. Results: The median (Q1, Q3) urine Se concentrations were 8.4 μg/L (5.3, 13.5) and 10.5 μg/L (6.5, 15.2) in children and WRA, respectively. There was moderate evidence for a relationship between urine Se concentration and plasma Se concentration in children (p = 0.0236) and WRA (p = < 0.0001), but the relationship had poor predictive value. Using previously defined thresholds for optimal activity of iodothyronine deiodinase (IDI), there was an association between deficiency when indicated by plasma Se concentrations and urine Se concentrations among WRA, but not among children. Discussion: Urine Se concentration poorly predicted plasma Se concentration at sub-district scales in Zimbabwe, limiting its value as a biomarker of population Se status in this context. Further research is warranted at wider spatial scales to determine the value of urine Se as a biomarker when there is greater heterogeneity in Se exposure

A pilot survey of selenium status and its geospatial variation among children and women in three rural districts of Zimbabwe

IntroductionSelenium (Se) deficiency is increasingly recognized as a public health problem in sub-Saharan Africa.MethodsThe current cross-sectional study assessed the prevalence and geospatial patterns of Se deficiency among children aged 6–59 months (n = 741) and women of 15–49 years old (n = 831) selected by simple random sampling in rural Zimbabwe (Murewa, Shamva, and Mutasa districts). Venous blood samples were collected and stored according to World Health Organization guidelines. Plasma Se concentration was determined by inductively coupled plasma-mass spectrometry.ResultsMedian, Q1, and Q3 plasma Se concentrations were 61.2, 48.7, and 73.3 μg/L for women and 40.5, 31.3, and 49.5 μg/L for children, respectively. Low plasma Se concentrations (9.41 μg/L in children and 10.20 μg/L in women) indicative of severe Se deficiency risk was observed. Overall, 94.6% of children and 69.8% of women had sub-optimal Se status defined by plasma Se concentrations of &lt;64.8 μg/L and &lt;70 μg/L, respectively.DiscussionHigh and widespread Se deficiency among women and children in the three districts is of public health concern and might be prevalent in other rural districts in Zimbabwe. Geostatistical analysis by conditional kriging showed a high risk of Se deficiency and that the Se status in women and children in Murewa, Shamva, and Mutasa districts was driven by short-range variations of up to ⁓12 km. Selenium status was homogenous within each district. However, there was substantial inter-district variation, indicative of marked spatial patterns if the sampling area is scaled up. A nationwide survey that explores the extent and spatial distribution of Se deficiency is warranted

Efficacy of novel small-quantity lipid-based nutrient supplements in improving long-chain polyunsaturated fatty acid status of South African infants: a randomised controlled trial

Background/objectives The objective of this study was to investigate the efficacy of small-quantity lipid-based nutrient supplements (SQ-LNS) containing essential fatty acids (EFAs) with or without long-chain polyunsaturated fatty acids (LCPUFAs) in improving LCPUFA status in South African infants fed complementary food. Subjects/methods Six-month-old infants (n = 750) were randomised to receive SQ-LNS, SQ-LNS-plus, or no supplement. Both SQ-LNSs contained micronutrients and EFAs. SQ-LNS-plus additionally contained the LCPUFAs arachidonic acid (AA) and docosahexaenoic acid (DHA), lysine, phytase and other nutrients. Plasma total phospholipid FA composition (% of total FAs) was measured at baseline (n = 353) and at 12 months (n = 293). Results At baseline, geometric mean (95% CI) plasma DHA and AA were 4.1 (4.0–4.3) and 11.5 (11.2–11.8)% respectively, with significantly higher plasma DHA and AA in breastfed than non-breastfed infants. Infants receiving the SQ-LNS-plus had significantly higher plasma DHA (4.52 (4.3–4.9)) at 12 months than the controls (3.8 (3.6–4.0)), with a higher effect size in infants who no longer received breast milk (β = 1.148 (95% CI = 0.597, 1.699)) than in infants who were still breastfeeding (β = 0.544 (95% CI = 0.179, 0.909)). There was no effect of either of the two SQ-LNSs on plasma AA. Consequently, infants receiving the SQ-LNS-plus had a significantly lower plasma n-6 to n-3 PUFA ratio at 12 months than control infants did. Conclusions Our study suggests that the provision of SQ-LNS-plus is efficacious in improving plasma DHA status. Particularly, infants who are no longer breastfed may benefit most from LCPUFA-enriched SQ-LN

Nutritional status and psychomotor development in 12–18-month-old children in a post-intervention study

Objectives: A study was undertaken to determine whether benefits gained by providing small-quantity lipid-based nutrient supplements (SQ-LNS) from age 6–12 months were maintained at age 18 months compared with a delayed intervention. Design: Children who completed a randomised controlled trial were enrolled at age 12 months (n = 392) and followed-up until age 18 months (n = 252; dropout rate 35.7%). Two previously exposed (PE and PE-plus) groups (received SQ-LNS from 6–12 months, but no supplement from 12–18 months) were compared with the delayed intervention (DI) group (received no supplement from 6–12 months, but received SQ-LNS from 12–18 months). Methods and outcome measures: At age 12 and 18 months, weight, length, haemoglobin (Hb) and psychomotor development were measured. Setting: The study was carried out in peri-urban Jouberton area, Klerksdorp, South Africa. Subjects: Children aged 12–18 months. Results: Compared with DI, negative effects (either a trend or statistically significant) were observed for PE and PE-plus for length-for-age Z-scores (LAZ) (p = 0.091 and p = 0.075, respectively), PE-plus for weight-for-age Z-scores (WAZ) (p = 0.027), and PE and PE-plus for Hb (p = 0.080 and p = 0.033, respectively); and a positive effect for PE-plus for eye–hand coordination (p = 0.086). The odds for anaemia were higher for PE-plus compared with DI (OR = 1.68; 95% CI 0.91, 3.09). Regardless of group, prevalence of anaemia and stunting increased from age 12 to age 18 months. Conclusions Benefits of providing SQ-LNS from age 6–12 months were not sustained at age 18 months, compared with providing SQ-LNS from age 12–18 months. Studies to determine the optimum supplementary period to achieve sustainable benefits of SQ-LNS on linear growth and iron status are warranted