Functional properties of edible insects: a systematic review

: Consumption of edible insects has been widely suggested as an environmentally sustainable substitute for meat to reduce GHG emissions. However, the novel research field for edible insects rely on the content of bioactive ingredients and on the ability to induce a functional effect in humans. The goal of this manuscript was to review the available body of evidence on the properties of edible insects in modulating oxidative and inflammatory stress, platelet aggregation, lipid and glucose metabolism and weight control. A search for literature investigating the functional role of edible insects was carried out in the PUBMED database using specific keywords. A total of 55 studies, meeting inclusion criteria after screening, were divided on the basis of the experimental approach: in vitro studies, cellular models/ex vivo studies or in vivo studies. In the majority of the studies, insects demonstrated the ability to reduce oxidative stress, modulate antioxidant status, restore the impaired activity of antioxidant enzymes and reduce markers of oxidative damage. Edible insects displayed anti-inflammatory activity reducing cytokines and modulating specific transcription factors. Results from animal studies suggest that edible insects can modulate lipid and glucose metabolism. The limited number of studies focused on the assessment of anticoagulation activity of edible insects make it difficult to draw conclusions. More evidence from dietary intervention studies in humans is needed to support the promising evidence from in vitro and animal models about the functional role of edible insects consumption

Protein quality of commonly consumed edible insects in Zimbabwe

Consumption of edible insects as alternative animal protein-source is a potential longterm solution to curb protein deficiency in resource-limited communities where diets lacking in protein are predominant. Entomophagy has been expressed in both developed and developing countries, and previous studies have proven that edible insects are high in protein. However, there is paucity of information on protein quality of edible insects to adequately guide populations on their utilization as good alternative protein sources. The aim of this study was to evaluate protein quality of three edible insects commonly consumed in most regions of Zimbabwe, namely Imbrasia belina (mopane worms), Locusta migratoria (locust) and Encosternum delegorguei (stinkbug). Kjeldahl method was used to evaluate crude protein of edible insects and a 20-day mice-feeding trial was conducted to evaluate protein efficiency ratio and protein digestibility in comparison to a control protein (casein). Crude protein was higher in Locusta migratoria (71.2%) compared to Imbrasia belina (57.7%) and Encosternum delegorguei (31.3%). Protein efficiency ratio was lower in insect samples L. migratoria (2.3), I Belina (1.96), E. delegorguei (2.0) compared to control casein (2.5). There was a significant difference (p<0.05) in protein efficiency ratio between the three edible insects and casein. Protein digestibility of the three insects (I. belina-92%, L. migratoria-90%, E. delegorguei-92%) was high and comparable to that of casein (96%). There was no significant difference (p>0.05) in protein digestibility between the three insect protein sources and casein. The results showed high protein quality of three edible insects commonly consumed in Zimbabwe comparable to casein, a high quality animal protein. High protein digestibility of edible insects indicated ease in absorption and improved utilisation in the body. The lower PER values for I. Belina and E. delegorguei could possibly indicate that these edible insects may be limiting in the amino acids that support body tissue building and growth. Edible insects are a good source of quality protein that could meet protein requirements in resource-limited populations to curb protein deficiency. There is a strong need to further promote edible insects as a good alternative animal protein source.Keywords: Protein Efficiency Ratio, Digestibility, Protein quality, Edible InsectsAfr. J. Food Agric. Nutr. Dev. 2019; 19(3): 14674-1468

Edible Insects

Insect protein production through ‘mini-livestock farming’ has enormous potential to reduce the level of malnutrition in critical areas across the world. It has been estimated that insect eating is practised regularly by over two billion people, mostly in China and in most tropical countries in Africa, South America, and Asia. However, eating insects has been taboo in many western nations. Reasons for this are discussed in this book with examples from Finland and the UK. The enormous boom of insect farming in Finland started in September 2017 when the business type was legalized. However, a large part of the population found the insect food too expensive and exotic. UK research outlines a multitude of promising strategies to overcome ‘western’ resistance to eating insects. This book also includes a chapter on the potential of insect farming to increase global food security. It shows that Africa is a hotspot of edible insect biodiversity and there more than 500 species consumed daily. We have several examples of viable insect farming businesses that can fight poverty and malnutrition in developing countries and provide profit and wealth to rural farmers. The chapters of the book cover countries such as Cameroon, Ecuador, Finland, Ghana, India, Mexico, the UK, and the US

Dietary Modulation of Oxidative Stress From Edible Insects: A Mini-Review

Edible insects are proposed as a nutritious and environmentally sustainable alternative source to animal proteins, due to their numerous advantages in terms of reduced ecological impact and high nutritional value. However, the novelty for edible insects relies on the content of bioactive ingredients potentially able to induce a functional effect in the body. The present review summarizes the main findings on the antioxidant properties of edible insects available in the literature. A total of 30 studies involving animals, cell cultures, or in vitro experimental studies evaluating the antioxidant effect of edible insects are presented in this work. When the antioxidant activity was investigated, using a wide variety of in vitro tests and in cellular models, positive results were shown. Dietary supplementation with edible insects was also able to counteract dietary oxidative stress in animal models, restoring the balance of antioxidant enzymes and reducing the formation of oxidation damage markers. On the basis of the reviewed evidences, edible insects might represent a source of novel redox ingredients at low ecological impact able to modulate oxidative stress. However, due to the fact that majority of these evidences have been obtained in vitro and in cellular and animal models, dietary intervention trials are needed to assess the efficacy of edible insect consumption to modulate redox status in humans

The effects of a land reform program on smallholder farmers’ livelihoods and availability of edible insects for food and nutrition security : the case of the Zvimba and Mhondoro districts of Zimbabwe

Edible insects are an important source of nutrition for rural populations in many parts of the world, including Zimbabwe. This research examines the contribution of edible insects to the livelihoods, food and nutrition security, and the strategies and mechanisms that can be implemented to ensure the preservation and better management of the environment and edible insects in Zvimba and Mhondoro districts. Case study analysis was incorporated into the study's mixed-method approach. 43% of the respondents who eat insects, do so because they enjoy the flavor, while 33% cite the insects' nutritional value, and 24% eat them for the novelty factor. More than half of all respondents in both districts said they liked eating insects as a relish, snack, or in combination with other relishes; another 20% said they liked eating insects as a relish and in combination with other relish dishes, and 22.2% said they liked eating insects only as a relish. Most respondents perceived a decline in edible insects’ availability. Despite this, both communities have developed sophisticated processing and preservation methods to make them accessible even outside of the peak insect-harvesting season. Both A1 (farmers with fields which are up to 37ha) and communal farmers have seen a decline in edible insects over the past few years, with 13% of that decline attributable to agricultural pest control and veld fires. The findings of the research can help lay a foundation for engaging different stakeholders, including communities, in developing solutions for sustainable edible insect management in support of food and nutritional security

Nutritional Value, Food Ingredients, Chemical and Species Composition of Edible Insects in China

As the prevailing food cultures, edible insects could be dated back to ancient China. It is becoming clear that insect resource can be mass‐produced in sustainable development food utilization. China could introduce insects into modern western diets. It is a precious resource considering the nutritional value, food ingredients and chemical composition of species. Meanwhile, the edible insects’ consumption also led to a challenge of addressing food security, nature conservation and the erosion of traditional food culture. We summarized the resourceful edible insects containing the nutrition substance, such as essential proteins, amino acids, fatty acids, carbohydrates, vitamins, mineral elements and other functional ingredients with the insect secondary metabolite, including the flavonoids, alkaloids, polysaccharides, hormones and phospholipids, which have high economic value for development and utilization.Based on the history, custom, plasmid resource, production and status of edible insects in China at present, it has been proven that the development of insects food well matches the need for human health in China

Assessment of knowledge on functional values of edible insects in Peri urban communities of Ijebu Ode Local Government area, Ogun State Nigeria

This study examined the knowledge on functional value of edible insect in per urban communities of Ijebu Ode Local Government Area (LGA) in  Ogun State. Sixty residents were selected through purposive sampling from 11 communities in the LGA. Primary data collected through   administered questionnaire. Both descriptive and inferential statistics were used for data analysis. Descriptive statistics such as simple percentage and frequency count were used. Hypothesis was tested using Pearson Product Moment Correlation (PPMC). The results revealed that about half (48.3%) of the respondents were between 31-40 years. A larger percentage was male (61.7%) and Christian (61.7%). Majority (68%) was married and 63.3% possess tertiary education. About one third of the respondents (33.3%) were civil servants and 28.3% earn between ₦41,000-₦60,000. Cricket, termite, palm weevil, yam beetle, caterpillar, silkworm, and locust respectively were the identified indigenous species of insects being consumed by the people. Also, more of the respondents eat crickets followed by locust and then termites. The results further revealed respondents’ knowledge of functional values of edible insects’ consumption and constraints to edible insects’ consumption. The results of the Pearson Product Moment  Correlation revealed that there is no significant relationship between respondent’s socio-economic characteristics’ and their edible insect  consumption at p < 0.05. This study concludes that residents of peri urban communities have good knowledge of functional values of edible insects. It is therefore recommended that there should be more awareness on consumption of edible insects since it is nutritious so that people can benefit from the numerous nutrients of these edible insects. Key words: functional value, edible insect, Ijebu Ode, pearson product moment correlatio

Allergy to Edible Insects: A Computational Identification of the IgE-Binding Cross-Reacting Allergen Repertoire of Edible Insects

Allergic manifestations to the ingestion of edible insects have been reported, especially in countries where edible insects are traditionally consumed. However, to date, allergens of edible insects have been poorly investigated. The AllergenOnline server was used for assessing the allergenic character of the putative IgE-binding cross-reactive allergens from the consumed yellow mealworm, silkworm, house fly maggot, migratory locust, house cricket, greater wax moth, black soldier fly, American grasshopper and Indian mealmoth. Positive hits correspond to allergens exhibiting >35% identity over an 80-residue sliding window and 100% identity over an 8-residue sliding window, respectively. Most of the hits consist of allergens from arthropods such as dust mites, crustaceans and insects, and more rarely, of allergens from mollusks, nematodes, and fungi. All the identifed allergens share conserved amino acid sequences and three-dimensional structures. Accordingly, the allergens of edible insects form clusters closely related to crustacean, mollusk and nematode clusters into the phylogenetic trees built up from the sequence alignments. Our computational investigations suggest edible insects possess a large repertoire of IgE-binding allergens they share with phylogenetically related groups of arthropods, mollusks, and nematodes. These cross-reacting allergens are susceptible to trigger allergic reactions in individuals previously sensitized to shellfish or mollusks

Entomophagy: Insects as Food

Due to the increasing cost of animal proteins, food and feed insecurity, population growth, and increasing need for protein-rich food in the developed and less developed countries, alternative sources of protein-rich food are highly needed. Scientific research has shown that edible insects are a very rich source of proteins and other nutrients. Hence, insect consumption might help revolutionaries’ food and feed insecurity and thus replace the conventional animal source. This work assesses the potential of insects as food for humans and feed for animals and gathers existing information and research on edible insects. The assessment is based on the most recent and complete data available from various sources and experts around the world, because lack of a complete data on edible insects reduces consumer confidence and limits integration of edible insect consumption with other food sources. Considering the nutritional, economic, and ecological advantages of edible insects over conventional livestock, much attention should therefore be given to their method of collection as this will help improve their availability. This could be achieved by improved conservation or by raising them as a minilivestock. Considering the economic, nutritional, and ecological advantages of this traditional food source, its promotion deserves more attention both from national governments and assistance programs

Entomophagy in the area surrounding LuiKotale, Salonga National Park, Democratic Republic of the Congo

Recent research has highlighted the importance of edible insects as a protein source in the developed and developing world, both as a traditional food and a more sustainable alternative to conventional livestock. However, there is concern that traditional ecological knowledge (TEK) concerning wild-collected insects is in danger of being lost. The Democratic Republic of the Congo (DRC) is a country that encompasses many diverse cultures, many of which are known to include insects in their dietary repertoire, yet data on TEK related to edible insects across this region is scarce. This study records local knowledge and, where possible, scientific identification of the insects consumed by human communities in the area adjacent to LuiKotale, Salonga National Park. Information was gathered using interviews and first-hand observations. A total of 31 edible insects are identified by their local names, and of these 10 are identified to species level. Collection methods are recorded for seven commonly consumed species. This article contributes to the scarce body of research detailing entomophagy in the DRC