Entomophagy in humans

Source: Wikipedia, the free encyclopedia.

Human consumption of a moth caterpillar (genus Cirina, Saturniidae) in Burkina Faso
Fried Cirina caterpillars being served on bread for human consumption

Entomophagy in humans or human entomophagy describes the consumption of insects (

myriapods, which is defined as arachnophagy
.

Entomophagy is scientifically documented as widespread among non-human

edible insect species and estimates that there were, in 2005, around two billion insect consumers worldwide. FAO suggests eating insects as a possible solution to environmental degradation caused by livestock production.[8]

In some societies, primarily

Insects eaten around the world include

).

History

Precursors of humans and insect consumption

Ancient hominids might have gathered termites similarly to this bonobo using a stick tool.

Evidence suggests that evolutionary precursors of Homo sapiens were entomophagous and

arboreal insectivores.[10] Similarly, most extant apes are insectivorous to some degree.[20][21][22]

The archaeological record, in the form of bone tools with wear marks, shows that early hominids such as Australopithecus robustus would gather termites for consumption.[23] Lesnik also reviews multiple studies concluding that wear marks running along the length of the bone are indicative of tools used for digging up termite mounds. These markings are different than those on tools that might have been used to dig up plants and roots, which would have wear marks in multiple directions from digging at a horizontal angle and possibly hitting rocks which are not present in termite hills.[24] Similarly a review of isotope studies show that A. robustus was not eating large amounts of plants and fruits as a source of protein, but it was instead being fulfilled by other means such as animal or insect protein.[24]

Modern human's larger brain size is often attributed to the theory that it was made possible due to an increase in the consumption of meat.[25] The remains of KNM-ER 1808, a specimen of Homo erectus dated to around 1.8 million years ago, has often been used as evidence for the hunter model due to its abnormal bone growths pointing to hypervitaminosis A from consuming excess animal liver.[26] However, Mark Skinner has proposed that consuming bee larvae and pupae could also provide enough vitamin A to cause hypervitaminosis A.[25] Due to insects nutritional value and abundance, they would also be able to provide the necessary amount of protein required for hominin such as H. erectus.

Les Trois Frères indicates a possible link with food magic.[27]

Coprolites and cave paintings

Before humans had tools to hunt or farm, insects may have represented an important part of their diet. Evidence has been found analyzing

lice), as well as arachnids (ticks, mites).[28]

Cave paintings in Altamira, north Spain, which have been dated from about 30,000 to 9,000 BC, depict the collection of edible insects and wild bee nests, suggesting a possibly entomophagous society.[28] Cocoons of wild silkworms (Triuncina religiosae) were found in ruins in Shanxi Province of China, from 2,000 to 2,500 years BC. The cocoons were discovered with large holes in them, suggesting the pupae were eaten.[28] Many ancient entomophagy practices have changed little over time compared with other agricultural practices, leading to the development of modern traditional entomophagy.[28]

Insect consumption in human cultures

Indonesian botok tawon, spiced bee larvae steamed in banana leaf package

Many cultures embrace the eating of insects. Edible insects have long been used by ethnic groups in Asia,[29][30][31][32][33][34][35] Africa, Mexico and South America as cheap and sustainable sources of protein. Up to 2,086 species are eaten by 3,071 ethnic groups in 130 countries.[7] The species include 235 butterflies and moths, 344 beetles, 313 ants, bees and wasps, 239 grasshoppers, crickets and cockroaches, 39 termites, and 20 dragonflies, as well as cicadas.[36] Insects are known to be eaten in 80 percent of the world's nations.[6]

The leafcutter ant

mopane worm, is a source of food protein. In Australia, the witchetty grub is eaten by the indigenous population. The grubs of Hypoderma tarandi, a reindeer parasite, were part of the traditional diet of the Nunamiut people.[37] Udonga montana is a pentatomid bug that has periodic population outbreaks and is eaten in northeastern India.[38]

Traditionally several

Papuan tribes in Eastern Indonesia, are known to consume ulat sagu (lit. 'sagoo caterpillar') or larvae of sago palm weevil. These protein-rich larvae are considered as a delicacy in Papua, eaten both roasted or uncooked.[41]

In

ant eggs (khai mot) and termites.[42][43]

The use of insects as an ingredient in traditional foodstuffs in places such as Hidalgo in Mexico has been on a large enough scale to cause their populations to decline.[44]

In East Africa, Kunga cake is a food made of densely compressed flies.[45]

In Western culture

As early as around 700 BC. In 400 BC an Assyrian depiction depicted a feast with locusts as a delicacy. Both the Bible and the Quran contain references to eating locusts. [27] Even in ancient times, the Greeks and Romans ate insects and especially their larvae, for example bees and cicadas. Pliny's cossus dwelling in oak, probably a wood borer caterpillar, was considered a delicacy by the Greeks and Romans. The

great capricorn beetle (Cerambyx cerdo syn.C. heros) is considered a strong candidate for identification of cossus by some authorities,[a] and while the stag beetle (Lucanus cervus) grub has also been considered a viable contender,[47] French entomologist Jean-Henri Fabre favored identification with the capricorn beetle's cousin[b] called ergat (Ergates faber), which he taste-tested himself, noting its almond-like flavor.[49]

In the study concerning the

Astragalus adscendens, but in older attestations, the types of high quality described as ges alefi or ges chonsari may have in fact been tamarisk manna or oak manna.[62]

Casu marzu is a traditional Sardinian
sheep milk cheese that contains insect larvae.

Although insect products such as

Casu marzu, for example, also called casu modde, casu cundhídu, or in Italian formaggio marcio, is a cheese made in Sardinia notable for being riddled with live insect larvae. Casu marzu means 'rotten cheese' in Sardinian language
and is known colloquially as "maggot cheese".

However, there is a trend in the West towards the consumption of insects.

Rangoli Restaurant, offered pizza made by sprinkling whole roasted crickets on naan dough[64][65]). Aspire Food Group was the first large-scale insect farming company in North America, using automated machinery in a 25,000-square-foot (2,300 m2) warehouse dedicated to raising organically grown house crickets for human consumption.[66]

Rejection and cultural taboo

Within

molluscs and the insects' close arthropod relatives crustaceans, and is not based on taste or food value.[67]

The

Maliki school of Islamic jurisprudence is the only tradition that allows the consumption of all insects (provided that they are not harmful to one's health). Some schools consider scorpions haram, but eating locusts as halal. Others prohibit all animals that creep, including insects.[68][69]

Within Judaism, most insects are not considered kosher, with the disputed exception of a few species of "kosher locust" which are accepted by certain communities.[70]

Public health nutritionist Alan Dangour has argued that large-scale entomophagy in Western culture faces "extremely large" barriers, which are "perhaps currently even likely to be insurmountable."[71] There is widespread disgust at entomophagy in the West, the image of insects being "unclean and disease-carrying".[72] The anthropologist Marvin Harris has suggested that the eating of insects is taboo in cultures that have other protein sources which require more work to obtain, such as poultry or cattle, though there are cultures which feature both animal husbandry and entomophagy. Examples can be found in Botswana, South Africa and Zimbabwe where strong cattle-raising traditions co-exist with entomophagy of insects like the mopane worm. In addition, people in cultures where entomophagy is common are not indiscriminate in their choice of insects, as Thai consumers of insects perceive edible insects not consumed within their culture in a similar way as Western consumers.[73]

Promotion

The U.S. Food and Agriculture Organization has displayed an interest in developing entomophagy on multiple occasions. In 2008, the FAO organized a conference to "discuss the potential for developing insects in the Asia and Pacific region."[74] According to Durst, FAO efforts in entomophagy will focus on regions in which entomophagy has been historically accepted but has recently experienced a decline in popularity.[citation needed]

In 2011, the European Commission issued a request for reports on the current use of insects as food, with the promise that reports from each European Union member state would serve to inform legislative proposals for the new process for insect foods.[75] According to NPR, the European Union is investing more than 4 million dollars to research entomophagy as a human protein source.[76]

Debate

Advantages of eating insects

Deep-fried crickets
Fried beetles in Lao cuisine
Jinan, China
, one with a bite taken out of it

Assessments of the potential of large-scale entomophagy have led some experts to suggest insects as a potential alternative protein source to conventional livestock, citing possible benefits including greater efficiency, lower resource use, increased food security, and environmental and economic sustainability.[77][78][79][80]

Nutritional benefits

Insects are a

amino acids) and contain a more useful amount, comparable with protein from soybeans, though less than in casein (found in foods such as cheese).[81] They have dietary fiber and include mostly unsaturated fat and contain some vitamins[82] and essential minerals.[83][84]

Food security

While more attention is needed to fully assess the potential of edible insects, they provide a natural source of essential nutrients, offering an opportunity to bridge the gap in protein consumption between poor and wealthy nations and also to lighten the ecological footprint.[79] Many insects contain abundant stores of lysine, an amino acid deficient in the diets of many people who depend heavily on grain.[85] Some argue that the combination of increasing land use pressure, climate change, and food grain shortages due to the use of maize as a biofuel feedstock will cause serious challenges for attempts to meet future protein demand.[78]

The first publication to suggest that edible insects could ease the problems of global food shortages was by

Food and Agriculture Organization of the United Nations released a publication titled Edible insects - Future prospects for food and feed security describing the contribution of insects to food security.[87] It shows the many traditional and potential new uses of insects for direct human consumption and the opportunities for and constraints to farming them for food and feed. It examines the body of research on issues such as insect nutrition and food safety, the use of insects as animal feed, and the processing and preservation of insects and their products.[87]

Sustainability and environmental benefits

The methods of matter assimilation and

According to the United Nations

animal agriculture makes a "very substantial contribution" to climate change, air pollution, land, soil and water degradation, land use concerns, deforestation and the reduction of biodiversity.[90] The high growth and intensity of animal agriculture has caused ecological damage worldwide; with meat production predicted to double from now to 2050, maintaining the status quo's environmental impact would demand a 50 percent reduction of impacts per unit of output. As the FAO states, animal livestock "emerges as one of the top two or three most significant contributors to the most serious environmental problems, at every scale from local to global."[90] Some researchers argue that establishing sustainable production systems will depend upon a large-scale replacement of traditional livestock with edible insects; such a shift would require a major change in Western perceptions of edible insects, pressure to conserve remaining habitats, and an economic push for food systems that incorporate insects into the supply chain.[80]

In total, the emissions of the livestock sector account for 18 percent of total anthropogenic

Economic benefits

Insects generally have a higher food conversion efficiency than more traditional meats, measured as efficiency of conversion of ingested food, or

Acheta domesticus) provide further evidence for the efficiency of insects as a food source. When reared at 30 °C or more and fed a diet of equal quality to the diet used to rear conventional livestock, crickets showed a food conversion twice as efficient as pigs and broiler chicks, four times that of sheep, and six times higher than steers when losses in carcass trim and dressing percentage are counted.[28]

Mexican chapulines

Insects reproduce at a faster rate than beef animals. A female cricket can lay from 1,200 to 1,500 eggs in three to four weeks, while for beef the ratio is four breeding animals for each market animal produced. This gives house crickets a true food conversion efficiency almost 20 times higher than beef.[28]

Scalability

The intentional cultivation of insects and edible arthropods for human food is now emerging in animal husbandry as an ecologically sound concept. Several analyses have found insect farming to be a more environmentally friendly alternative to traditional animal livestocking.[77][93]

In Thailand, two types of edible insects (cricket and palm weevil larvae) are commonly farmed in the north and south respectively.[94] Cricket-farming approaches throughout the northeast are similar and breeding techniques have not changed much since the technology was introduced 15 years ago. Small-scale cricket farming, involving a small number of breeding tanks, is rarely found today and most of the farms are medium- or large-scale enterprises. Community cooperatives of cricket farmers have been established to disseminate information on technical farming, marketing and business issues, particularly in northeastern and northern Thailand. Cricket farming has developed into a significant animal husbandry sector and is the main source of income for a number of farmers. In 2013, there were approximately 20,000 farms operating 217,529 rearing pens.[94] Total production over the last six years (1996-2011) has averaged around 7,500 tonnes per year.[citation needed]

In the Western world, new agricultural technology companies[95] have been founded in the 2010s with the aim of modernizing insect rearing techniques, permitting the scale and efficiency gains required for insects to displace other animal proteins in the human food supply.

Indigenous cultivation

Edible insects can provide economic, nutritional, and ecological advantages to the

forest conservation through a solution that includes appropriate habitat management and recognition of local traditional knowledge and enterprises.[96] Cultures in Africa have developed unique interactions with insects as a result of their traditional ecological management practices and customs. However, senior FAO forestry officer Patrick Durst claims that "Among forest managers, there is very little knowledge or appreciation of the potential for managing and harvesting insects sustainably. On the other hand, traditional forest-dwellers and forest-dependent people often possess remarkable knowledge of the insects and their management."[74]

Similarly, Julieta Ramos-Elorduy has stated that rural populations, who primarily "search, gather, fix, commercialize and store this important natural resource", do not exterminate the species which are valuable to their lives and livelihoods.[7] According to the FAO, many experts see income opportunities for rural people involved in cultivation. However, adapting food technology and safety standards to insect-based foods would enhance these prospects by providing a clear legal foundation for insect-based foods.[74]

Pest harvesting

oil palms
, is a delicacy in Papua New Guinea and eastern Indonesia.

Some researchers have proposed entomophagy as a solution to policy incoherence created by traditional agriculture, by which conditions are created which favor a few insect species, which then multiply and are termed "pests".[78] In parts of Mexico, the grasshopper Sphenarium purpurascens is controlled by its capture and use as food. Such strategies allow decreased use of pesticides and create a source of income for farmers totaling nearly US$3000 per family. Environmental impact aside, some argue that pesticide use is inefficient economically due to its destruction of insects which may contain up to 75 percent animal protein in order to save crops containing no more than 14 percent protein.[78]

Use as therapeutic foods

Director of pediatric nutrition at the

coronary disease.[5]

In 2012, Dr. Aaron T. Dossey announced that his company, All Things Bugs, had been named a Grand Challenges Explorations winner by the Bill & Melinda Gates Foundation.[97] Grand Challenges Explorations provides funding to individuals with ideas for new approaches to public health and development. The research project is titled "Good Bugs: Sustainable Food for Malnutrition in Children".[97]

Potential as alternative pet food

There is potential for insects to be used as a protein source in insect-based pet food. Novel protein sources have possible benefits for pets with sensitive gastrointestinal tracts or food allergies, as the proteins are not recognized by the animal's body, and therefore are less likely to cause irritation.[98] Insects have also been shown to have a high palatibility to both companion and livestock animals.[99] They have a good amino acid profile, and also contain many essential nutrients for companion animals. Insects have also been shown to have a high digestibility in pets.[100] There have been studies done evaluating the protein quality of commonly used insects and their nutrient values in comparison to traditional pet food protein.[101]

Disadvantages and challenges

Spoilage

Spore-forming bacteria can spoil both raw and cooked insect protein, threatening to cause food poisoning. While edible insects must be processed with care, simple methods are available to prevent spoilage. Boiling before refrigeration is recommended; drying, acidification, or use in fermented foods also seem promising.[102]

Toxicity

In general, many insects are herbivorous and less problematic than omnivores. Cooking is advisable in ideal circumstances since parasites of concern may be present. But pesticide use can make insects unsuitable for human consumption. Herbicides can accumulate in insects through bioaccumulation. For example, when locust outbreaks are treated by spraying, people can no longer eat them. This may pose a problem since edible plants have been consumed by the locusts themselves.[28]

In some cases, insects may be edible regardless of their toxicity. In the Carnia region of Italy, moths of the Zygaenidae family have been eaten by children despite their potential toxicity. The moths are known to produce hydrogen cyanide precursors in both larvae and adults. However, the crops of the adult moths contain cyanogenic chemicals in extremely low quantities along with high concentrations of sugar, making Zygaena a convenient supplementary source of sugar during the early summer. The moths are very common and easy to catch by hand, and the low cyanogenic content makes Zygaena a minimally risky seasonal delicacy.[103]

Cases of

California Department of Health Services in November 2003.[104]

Allergic reactions

Adverse allergic reactions are a potential hazard of insect consumption.[105] Cross-reactivity between edible insects and crustaceans has been identified as clinically relevant in one review.[106] A study on the prevalence of allergies to edible insects in Thailand indicated that:

[A]pproximately 7.4% of people experienced an adverse reaction indicative of an edible-insect allergy and 14.7% of people experienced multiple adverse reactions indicative of an edible-insect allergy. Furthermore, approximately 46.2% of people who already suffer from a known food-based allergy also experienced symptoms indicative of an allergic reaction after insect consumption.[107]

Ethical objections

The humaneness of insect consumption has been questioned. One objection is the large numbers of individuals raised and killed per unit of protein—exacerbated by a high tendency towards premature mortality—in comparison to other animal-based foods.[108] The potential for insects to be conscious, and as a result experience pain and suffering, has also been raised as a concern.[109][110]

Negative sustainability aspects

Concerns have been raised about the sustainability of insect consumption, such as overexploitation due to wild-harvesting.[111] Food used to feed the insects raised for consumption may also have a large environmental footprint, which when scaled-up, could potentially make insect consumption similarly sustainable to traditional protein sources, negating any alleged benefit.[112] Additionally, edible insect preservation processes such as freeze-drying and grinding may use a large amount of energy.[113] Insect consumption has been suggested to be more sustainable than consumption of other animals.[114][115]

See also

Notes

  1. ^ Mulsant (1841a)(repub. Mulsant (1841b)),[46] endorsed by Bodenheimer (2013) [1951], pp. 42–43 rejecting Linnaeus's identification with the moth Cossus since it rarely if ever hosts in oak.
  2. ^ Both are Prioninae longicorns.

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Bibliography and further reading

External links