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If i am correct then most people who farm insects like crickets or superworms are feeding them lots of carbohydrates.
I am working as a zookeeper for around 10 years and i know from experience that it's best for the most animals to give them food what is most close to their natural food. For insects, it would be the same i think. I've read alot of feeding recipes and most are very carbohydrate rich. Do crickets for example even get that much carbohydrates in the wild? I never heard anyone feeding them hay.
I think we can learn alot of the insects we are farming if we look at the wild living insects.
For mealworms - are they only living as pests for us humans and eat stored grains? Or is there a wild form that eats something else?