The ‘feed conversion ratio’ - the amount of feed needed to be put in compared with the amount of food produced - for insects means that they waste more food than they produce. Why insect farming isn't going to save the planet, from Philip Lymbery:
But in order to overcome Western sensibilities, insects are being farmed then powdered or turned into flour. Insect burgers made from buffalo worms and organic soya are popping up in restaurants and supermarkets.
Insects are increasingly intensively farmed, where they are commonly reared by feeding them on cereals and soya that could be feeding people. The main reason for the ‘not enough’ illusion is the amount lost due to food waste and the quantity of cereals and soya fed to livestock, whether chickens, cows or crickets.
The rationale for industrial insect farming becomes even more tenuous when the purpose is to feed livestock. Perfectly good crops are fed to insects, which are then fed to pigs, chickens and fish.on the industrial production of cereals, which usually means spraying the countryside with insecticides.
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