Cross-validation of the entomophagy attitude questionnaire (EAQ): A study in China on eaters and non-eaters

Research interest in direct entomophagy (the eating of insects) and indirect entomophagy (the eating of insects-fed animals) has grown exponentially in recent years. The use of insects as food and feed is a potential avenue to meet the growing global food demand, and for enhancing the sustainability of animal diets as well. The Entomophagy Attitude Questionnaire (EAQ) has been recently proposed as a specific measure of attitudes towards direct and indirect entomophagy. First aim of the current study was to cross-validate the EAQ in a non-Western country. An additional aim was to explore the differences between who have previously eaten insects and who have not. Hence, the EAQ was administered to a convenience Chinese sample (N = 395), together with measures of intention to eat insects either directly or indirectly. Confirmatory Factor Analysis showed a satisfactory fit of the EAQ three-factor model. The instrument showed adequate psychometric properties, and evidences of convergent and divergent validity of EAQ’s latent constructs were found. In addition, EAQ was found to predict effectively participants’ intention to engage both in direct and indirect entomophagy. Results thus support the validity of EAQ and the conceptualization underpinning it in a non-Western country. The main difference emerged between eaters and non-eaters regards the role of disgust, which is more predictive of intention for non-eaters, whereas positive attitude (interest) is more predictive for eaters. Hence, different communication strategies are suggested for individuals who already have vs. have not experienced the direct or indirect eating of insects.     

Consumer acceptance of insect-based alternative meat products in Western countries

During the past few years, entomophagy has been increasing in significance. As insects are generally high in protein, they are principally considered as meat substitutes. Nevertheless, in Western countries, meat substitute consumption is actually very low, principally due to food neophobia and poor sensory qualities in comparison with meat. In insect particular case, food neophobia is clearly high. To reduce insect food neophobia, previous studies suggest to insert invisible insect in food preparation and/or to associate them with known flavors. In this study, a survey on entomophagy perception and hedonic tests were realized to assess the level of sensory-liking of hybrid insect-based burgers (beef, lentils, mealworms and beef, mealworms and lentils). Participants’ overall liking of the four burgers differed between genders and was influenced by burger appearance and taste. Women clearly preferred beef burger appearance, whereas men preferred the appearance of beef and insect-based burgers. Concerning insect-based burger taste, participants (men and women) rated it intermediately, between that of the beef and lentil burger, with a preference for the mealworm and beef burger. Results also showed that people with previous entomophagy experience was limited but that they gave globally higher ratings to all preparations. In conclusion, insect tasting sessions are important to decrease food neophobia, as they encourage people to “take the first step” and become acquainted with entomophagy. Nevertheless, insect integration into Western food culture will involve a transitional phase with minced or powdered insects incorporated into ready-to-eat preparations, as people are not ready to add insects to their diets in “whole form.”     

We will eat disgusting foods together – Evidence of the normative basis of Western entomophagy-disgust from an insect tasting

Insects are a highly sustainable and nutritious source of protein, and, thus, incorporating insects in to Western food culture is one way to address major global challenges like global warming and deforestation. Consumer studies show, however, that Westerners’ willingness to eat insect-containing food is low. One formidable barrier is the perception that insects are disgusting, and it is generally believed that this insect-disgust is driven by a fear of contamination and disease. Another barrier is the lack of social norms related to entomophagy in the West. In the present study, we tested effects of fear of contamination and perceived social eating norm with a survey and a tasting session administered to a Danish college sample (N = 189). Correlation analyses and multivariate regression analyses revealed that selfreported trait-level Pathogen Disgust and Perceived Infectability did not consistently predict insect eating disgust, willingness to eat insects, or actual insect tasting behavior in the tasting session. In contrast, perceived insect eating norm emerged as a significant predictor of insect tasting behavior. These findings suggest that perceived social norms play a substantial role in Westerners’ (un)willingness to eat insects. The result gives reason for optimism for aspirations of introducing insects in Western food diet and point to avenues for harnessing social norms in marketing efforts.     

Nutritional composition and safety aspects of edible insects

Insects, a traditional food in many parts of the world, are highly nutritious and especially rich in proteins and thus represent a potential food and protein source. A compilation of 236 nutrient compositions in addition to amino acid spectra and fatty acid compositions as well as mineral and vitamin contents of various edible insects as derived from literature is given and the risks and benefits of entomophagy are discussed. Although the data were subject to a large variation, it could be concluded that many edible insects provide satisfactorily with energy and protein, meet amino acid requirements for humans, are high in MUFA and/or PUFA, and rich in several micronutrients such as copper, iron, magnesium, manganese, phosphorous, selenium, and zinc as well as riboflavin, pantothenic acid, biotin, and in some cases folic acid. Liabilities of entomophagy include the possible content of allergenic and toxic substances as well as antinutrients and the presence of pathogens. More data are required for a thorough assessment of the nutritional potential of edible insects and proper processing and decontamination methods have to be developed to ensure food safety.     

Nutritional,functional and biological properties of insect proteins: Processes for obtaining,consumption and future challenges

BackgroundConsuming insects as an alternative protein source is considered a future trend and a viable strategy that could potentially contribute to global food security. Insects are a non-conventional source of protein, either for human consumption directly or indirectly as a component in recomposed foods or added to feedstock mixtures. Moreover, these proteins have demonstrated a broad range of applications as peptides with antihypertensive, antimicrobial and antioxidant properties. However, aspects such as food safety and processing of these proteins need further studies for their elucidation and optimization.Scope and approachIn this review, aspects of nutritional value and risks of insect consumption are reported. Additionally, conventional processing techniques and recent advances in insect protein extraction and production are presented. The application of bioactive peptides obtained from insect protein hydrolysates is reported, focusing on their potential antihypertensive, antimicrobial and antioxidant properties.Key findings and conclusionsInsect proteins have great advantages in terms of nutritional value, total protein level and amino acid profile. However, some safety concerns must be taken into consideration in large-scale production. The conventional processing of insects proteins is very particular, depending on several aspects such as species, larval stage, and cultivation, among others. Nonetheless, recent advances in insect protein production via enzymatic hydrolysis and heterologous expression have shown a promising technology for the study and exploitation of their bioactive properties, such as the antimicrobial, antioxidant and antihypertensive (inhibition of ACE) activity of insect peptides.     

Disgusting or delicious? Examining attitudinal ambivalence towards entomophagy among Danish consumers

Current meat consumption habits will need to change, especially those of Western consumers. The level of meat consumption is unsustainable, and a recent study estimates a necessary reduction of 90% of the current intake. Insects are a promising alternative to existing protein sources, but previous literature has emphasised the initial level of disgust displayed towards insects as a food option. The overall aim of this paper is to understand the attitude of consumers towards eating insects, also termed entomophagy, in order to outline the barriers that prevent adoption and provide insights in order to overcome these. Data were collected through an online questionnaire with a representative sample of Danish consumers (n = 975). Several constructs from the literature were measured: food neophobia, disgust, intention to try and intention to eat regularly. In addition, a new attitude scale was used, that specifically measures the attitude towards entomophagy. A discrete choice experiment was a part of the questionnaire. Using LatentGold 5.1 a segmentation analysis based on the choice experiment was conducted. The influences of intention were analysed using hierarchical regression in SPSS 25. Results of the choice experiment indicate that different segments of consumers of entomophagy exist, and that different segments are interested in different types of insects. Younger consumers and males are more positive towards entomophagy in general and the insect options in the choice experiment. Results of the regression analysis indicate that the attitude toward eating insects is multidimensional and that there seem to be indications of attitude ambivalence in all segments. The interest in entomophagy is important, as it will be a key factor in overcoming the barrier of disgust and turning insects into an acceptable food choice in the Western world.     

A self-report measure of attitudes toward the eating of insects: construction and validation of the Entomophagy Attitude Questionnaire

Research has made steps towards the understanding of the main drivers and barriers related to Western consumers’ acceptance of food with ingredients derived from insects. Nevertheless, research has been hampered by the absence of a comprehensive, specific, and validated instrument for measuring consumer attitudes towards entomophagy. The current study presents a new self-report instrument for addressing this issue. The instrument was built upon three conceptual cores, which are reflected in the three factors emerged and tested through factor analyses performed on a representative sample of the Danish population (Study 1: N = 975), and a convenience Italian sample (Study 2: N = 543). The first factor represents the negative evaluation of direct entomophagy and is closely connected to disgust. The second factor represents the positive evaluation of direct entomophagy and is closely linked to individuals’ interest to try novel experiences and to eat novel foods. The third factor addresses indirect entomophagy, that is, the attitude towards using insects for feeding other animals that are reared for human consumption. Compared to existing measures of disgust and neophobia, the new instrument performs better in predicting intention in relation to both direct and indirect entomophagy.     

Recent developments in applications of radio frequency heating for improving safety and quality of food grains and their products: A review

Abstract

Food grains constitute a vital part of the daily diet of the population worldwide, and are generally considered as safe products with high storage stability due to their low moisture contents. However, post-harvest losses (PHL) caused by insects, fungi, food-borne pathogens, and undesirable enzymes remain a major concern for the grain industry. Thermal treatments are commonly used to reduce the PHL of grains and their products without any chemical residues. Among which, radio frequency (RF) technology has been regarded as a promising alternative to traditional heating methods for improving safety and quality of food grains due to its fast, volumetric, and deep penetration heating characteristics. This review provided comprehensive information about principles of RF technology and its main applications including disinfestation, pasteurization, enzyme inactivation, drying, and roasting for processing food grains and their products. The methods to improve the RF heating uniformity and effects of RF heating on product quality were also reviewed. Finally, the current problems and recommendations for future work related to RF processing of grains and their products were discussed. This review would improve the understanding of RF heating for food grains and their products and promote the application of RF technology in the food grain industry.     

Product appropriateness,willingness to try and perceived risks of foods containing insect protein powder: A survey of U.S. consumers

As a sustainable alternative to livestock consumption, insect protein has applications beyond meat substitution. However, strategies to normalise entomophagy in the United States have been less explored than in Europe. Two online surveys (N = 1005 U.S. consumers) identified the most appropriate products, from a list of 30, for insect protein powder incorporation by evaluating willingness to try (WTT). Consumers reported perceived risks for negative WTT, and the effect of entomophagy benefit information (EBI) on WTT was measured. Overall, 72% of consumers were willing to consume at least one insect-containing product. The three most appropriate products were protein/energy bars, chips/snack crackers and protein shakes. Bakery/cereal products garnered positive WTT by >54% of consumers, followed by snacks/candy (53%). Unfamiliarity with insects as food was the most cited risk. EBI presentation significantly increased (α < 0.05, McNemar’s test) positive WTT for all products. Once unfamiliarity is overcome through trial, negative emotions and concerns about sensory quality can be addressed.     

Which insect species can best be proposed for human consumption?

Edible insects have become popular in the past few years not only in the scientific literature but in other media as well. One of the major advantages of entomophagy (eating insects) is said to be the great nutritional composition. Many sources report that insects (generally) have better nutritional characteristics than traditional protein sources. In our research, we aim to give a complete picture of the nutritional profile of insects using a multicriteria optimization method, sum of ranking differences. The materials we used are published results of different authors from the past few years. The proximate analysis tells that insects generally have a better nutritional profile than other meats. The situation is a bit different in the case of mineral content; hence some vegetables have excellent mineral sources but waxworm larvae were ranked in the first three. Additionally, waxworm larvae have the most similar amino acid pattern to the FAO recommendation for adults. Earthworm, house cricket, and mealworm larvae showed the most promising vitamin content; however, huge differences were observed between the developmental stages of insects. A detailed analysis of these differences on the example of mealworms showed that adults may present a better option from the nutritional point of view. Same measurements conducted by different authors on the same species show considerable differences; hence the comparison of the results of different publications is dubious and should be handled with care. Based on our results, insects have a promising nutritional profile and may become part of many food products in the future. Present status of knowledge allows to conclude; which insect is best suitable for human consumption.     

Profiling consumers who are ready to adopt insects as a meat substitute in a Western society

This study investigates the readiness of consumers in a Western society, where traditional meat consumption prevails, to adopt insects as a substitute for meat. Using cross-sectional data (n = 368) and binary logistic regression modeling, the study identifies gender, age, familiarity, food neophobia, convenience and environmental food choice motives, as well as meat-related attitudes and future meat consumption intentions as significant predictors. The predicted likelihood of adopting insects as a substitute for meat is 12.8% [95% CI: 6.1–19.4%] for males and 6.3% [95% CI: 2.8–9.9%] for females, other predictor variables held constant at their mean value. People who claim to be familiar with the idea of eating insects have a 2.6 times higher likelihood, and consumers who intend to reduce fresh meat intake are up to 4.5 times more likely to adopt insects. Food neophobia makes the largest contribution to consumers’ readiness to adopt insects: a one-unit increase in the food neophobia score is associated with a 84% decrease in the predicted odds of being ready to adopt insects. A stronger convenience orientation in food choice and a higher interest in the environmental impact of food choice increase the likelihood of adopting insects by 75% and 71% per unit increase in these predictors’ scores, respectively. By contrast, a one-unit stronger belief that meat is nutritious and healthy, and a one-unit higher importance attached to taste for meat lower the predicted odds by 64% and 61%, respectively. This study reveals that the most likely early adopters of insects as a novel and more sustainable protein source in Western societies are younger males with a weak attachment to meat, who are more open to trying novel foods and interested in the environmental impact of their food choice.     

Ugly but tasty: A systematic review of possible human and animal health risks related to entomophagy

Background: According to many recent studies, the use of insects as food seems to be convenient, sustainable, economical and healthy. The objective of this study is to analyze the possible effects of insect consumption on human and animal health. Methods: A systematic review of the literature was performed using the PubMed, Scopus and CAB databases. Results: Of the 6026 items initially retrieved, 70 were eligible for inclusion; 40 studies analyzed the use of insects in human foods or drugs, while 30 analyzed the use of insects in animal feed. In humans, the most commonly analyzed risks are nutrient malabsorption, growth alteration, chemical and microbiological contamination and allergy risk. Studies of animals focus on growth alteration, nutrient malabsorption and hematic and qualitative meat alteration. Conclusion: In recent years, researchers have shifted their focus from the possible use of edible insects in animal feed to their use as possible nutrient sources for humans. The results suggest that, if properly treated and preserved, products derived from insects are safe and efficient sources of nutrients for animals. Further studies are needed to evaluate the possible effects of prolonged insect consumption on human health.     

Traditional consumption of and rearing edible insects in Africa,Asia and Europe

ABSTRACT

The traditional consumption of edible insects is common in one third of the world's population, mostly in Latin America, Africa and Asia. There are over one thousand identified species of insects eaten in some stage of their life cycle; and they play important roles in ensuring food security. The most common way to collect insects are from the wild, which is seasonal with limited availability and has an increasing demand resulting in a disruption to the ecosystem. There is a growing interest shown in rearing insects for commercial purposes, and an industrial scale production will be required to ensure steady supplies. Industrial production will need to take into account the living environment of insects, the nutritional composition of their feed and the overall efficiency of the production system. We provide a short overview on the consumption of and rearing insects in Africa, Asia and Europe. For Africa, a snapshot is given for Nigeria, Ghana, Central African Republic, Kenya and Uganda, while the following countries are reported for Asia: China, Japan, Lao People's Democratic Republic, Thailand and Vietnam. In addition, a list of insect species with the highest potential for food and feed in the European Union is provided with some reference to The Netherlands and Finland. The review concludes that there is need to better understand the rearing and farming procedures that will yield high quality edible insects in Africa, Asia and Europe.     

Acceptance of insect-based food in Chile: Evidence from a survey using the entomophagy attitude questionnaire (EAQ)

Research interest in the acceptability of insects as food has dramatically grown in recent years. Investigators have studied the antecedents of people willingness to eat whole insects, processed (non-visible) insects, and insect-fed animals as well. Another important topic is the difference between intention to try insect-based foods once, and readiness to adopt these foods in everyday diet. In 2020, the Entomophagy Attitude Questionnaire has been developed as a tool for researchers in this area. It is the only one self-report questionnaire specific to entomophagy, multi-dimensional, and cross-validated in diverse contexts and languages. The current study contributes to further validate this instrument in Spanish, in a novel context such as Chile, and to expand its nomological validity to intention to eat processed insects. In addition, results show that the three components of the EAQ significantly predict participants’ intention to try insect-based foods and, to a lesser extent, intention to add insect-based food in one own’s diet. Limitations of the study, as well as direction for further research are discussed in the paper.     

The insectivore’s dilemma,and how to take the West out of it

A number of health and agricultural organizations have been encouraging Westerners to integrate insects into their diet, without success. Appealing to consumer’s reason and responsibility, as they do, is likely to reinforce a dilemma in the mind of consumers: many know that they can, in principle, eat insects, and perhaps that they should eat some, but very few are willing to eat them. Here we argue that current strategies are on the wrong track in identifying the key obstacle to overcome as a question of the negative representation of insects. Decades of laboratory research, as well as years of experience in gastronomy, suggest that people’s food choices are relatively immune to rational changes of representation, and instead tend to be driven by taste preferences and exposure. Here we suggest an alternative sensorially-driven strategy, which stands a much greater chance of making people eat insects on a regular basis. The turn – or better said return – to entomophagy in this sense, needs to be driven by a psychologically realistic motivation and gastronomic interest.     

Global land acquisition: neo-colonialism or development opportunity?

Increasingly, developing nations which are land rich are sanctioning the sale or transfer of user rights of large tracts of farmland for foreign investment. While this issue is of relatively recent origin, caused in large measure by the recent global food crisis and related to desires by food importing countries to have greater control over their food supply, the impact on food security could be very significant. Because of the newness of the matter, most of the available evidence is found outside traditional academic literature. Poor, smallholder farmers without formal land titles currently occupy much of the land sold in these transactions, threatening the internal food security of the lessor state. Factors driving the global acquisition of land include development aid shortfalls, the global food crisis, the burgeoning middle class in middle- and high-income nations, and the increasing acceptance of biofuels as a viable alternative source of fuel by governments of these nations. The risks associated with the global acquisition of land on food security of the seller country are manifold. This article reviews the current literature available on the subject and makes policy suggestions for equitable investment and benefit-sharing for all stakeholders. Opportunities and risks abound but if the risks are mitigated, then the global acquisition of land has the potential to be an unparalleled development opportunity for lessor states.     

Biomimetic plant foods: Structural design and functionality

BackgroundThe rising number of people living with chronic conditions, such as diabetes and cardiovascular disease, along with the widespread demand for healthier foods have posed significant challenges to the food industry. Plant-based foods, beyond simple nutrition, can provide health-benefiting functionalities within the complex environment of the human gastrointestinal (GI) tract. Biomimetics is defined as taking inspirations from nature to solve problems. Biomimetic plant foods (BPFs) can offer solutions for the future with the design of nature-inspired food structures for improved health and well-being.Scope and approachThis review provides an insight into the assembly of plant food structures and their disassembly in the human GI tract. Their role in controlling the digestive fate of nutrients is elucidated. Recent developments and future perspectives on designing BPFs are also presented and discussed.Key findings and conclusionsPlant foods in nature possess hierarchically self-assembled structures. During processing and GI digestion, these structures are disassembled to enable liberation and assimilation of nutrients and bioactive molecules contained within the food matrix. The assembly and disassembly are linked to a hierarchy of structure in plants within which different levels (molecule, polymer, cell wall, cell, tissue, organ) and their interactions can modulate nutrient bioaccessibility and digestion. Inspired by nature, BPFs can be engineered to deliver in-body functionality. The emerging trend of biomimetics will potentially pave the way for the future of food.     

Potential efficacy of processing technologies for mitigating crustacean allergenicity

ABSTRACT

Crustacean allergy has become a growing food safety concern at a global scale. In the past decades, various food processing approaches have been employed to develop food products with reduced allergenic potential. Thermal treatment can dramatically influence the allergenicity of crustaceans by either reducing or enhancing their allergenic potential. Maillard reaction, enzymatic and acid treatments have shown to be promising in mitigating crustacean allergenicity. Recently, novel processing technologies, namely high-pressure processing, high-intensity ultrasound, irradiation, pulsed ultraviolet light and hurdle technology have attracted special attention from the researchers and the food industry professionals owing to their benefits over the conventional methods. In this context, this review paper provides an updated overview of the current knowledge on how different food processing methods induce structural changes of crustacean allergens and, subsequently, influence their allergenic potential. Data on prevalence and clinical relevance of crustacean allergy are presented, as well as, the molecular characterization of crustacean allergens and the main analytical methods for their detection in processed foods.     

The use of edible insect proteins in food: Challenges and issues related to their functional properties

Over the past decade, the potential of edible insects as a novel ingredient in high value-added products has been investigated to find alternatives to conventional protein sources that are expensive, over-exploited and harmful to the environment. This review assesses the state of insects as an alternative protein source from production to consumption. More specifically, this review details the conventional procedures related to the production of insect flours as well as insect-derived ingredients such as protein concentrates and isolates. As a source of alternative protein in food ingredient formulations, the available data on the functionalities of edible insect ingredients is also examined and compared to conventional animal- and plant-based protein sources. Finally, the major challenges facing entomophagy in the mainstream food industry are explored. This review highlights the fact that insect proteins can serve as functional ingredients in food preparation. However, additional comparative studies are required to assess the functionality of various insect proteins compared to conventional proteins, regardless of processing method. To be incorporated into large scale industries, more research is needed to optimize processing methods to obtain the best compromise between cost-effectiveness, functionality, tastiness and sustainability, while ensuring consumer safety.     

Postharvest processes of edible insects in Africa: A review of processing methods,and the implications for nutrition,safety and new products development

In many African cultures, insects are part of the diet of humans and domesticated animals. Compared to conventional food and feed sources, insects have been associated with a low ecological foot print because fewer natural resources are required for their production. To this end, the Food and Agriculture Organization of the United Nations recognized the role that edible insects can play in improving global food and nutrition security; processing technologies, as well as packaging and storage techniques that improve shelf-life were identified as being crucial. However, knowledge of these aspects in light of nutritional value, safety, and functionality is fragmentary and needs to be consolidated. This review attempts to contribute to this effort by evaluating the available evidence on postharvest processes for edible insects in Africa, with the aim of identifying areas that need research impetus. It further draws attention to potential postharvest technology options for overcoming hurdles associated with utilization of insects for food and feed. A greater research thrust is needed in processing and this can build on traditional knowledge. The focus should be to establish optimal techniques that improve presentation, quality and safety of products, and open possibilities to diversify use of edible insects for other benefits.