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Insects can be a good source of not only protein, but also vitamins, minerals, and fats. For example, crickets are high in calcium, and termites are rich in iron. One hundred grams of giant silkworm moth larvae provide 100 percent of the daily requirements for copper, zinc, iron, thiamin, and riboflavin.
They are eaten around the world. Some insects are eaten as larvae or pupae, others as adults. Though not insects, arachnids such as spiders, tarantulas and scorpions are also eaten. A total of 1417 species of insects have been recorded as being eaten by over 3000 ethnic groups. These include 235 species of butterflies and moths, 344 species of beetles, 313 species of ants, bees and wasps as well as 239 species of grasshoppers, crickets and cockroaches, amongst others. Other commonly eaten insects are termites, cicadas and dragonflies. Insects are known to be eaten in 80% of the world's nations.
Another major advantage is the fact that insects generally have a higher food conversion efficiency than more traditional meats, measured as efficiency of conversion of ingested food, or ECI. While many insects can have an energy input to protein output ratio of around 4:1, raised livestock has a ratio closer to 54:1.

But until now nobody ever seemed to try to build micro-farms to produce them in mass quantity. Since they eat plants that aren’t used for human consumption this should have helped in times of bad harvest, at least to give humans the necessary amount of vitamin and proteins.
Also they could be transported much easier than any livestock on long journeys by ship. This might prevent things like scurvy for example.
So why didn`t it happen?
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