I will go with a varied diet and cricket/mealworm as a staple diet and dont gut load them with cat food it has a lot of crap if you read the ingredients to gut load them give fluker's cricket gut load and the calcuim plus WATER SPHERES
Is this the crap you are referring to in the cat food ? Come on how bad could this be, it is all clearly labeled !!
Grain products, plant protein products, processed grain by-products, animal protein products, forage products, can molasses, calcium, calcium carbonate, dicalcium phosphate, salt, DL-methionine, Vitamin A acetate, D-activated animal sterol (source of Vitamin D3), Vitamin E supplement, Vitamin B12 supplement, riboflavin supplement, niacin bisulfite complex, folic acid, pyridoxine hydrochloride, thiamine mononitrate, sodium selenite, biotin, manganese sulfate, zinc sulfate, ferrous sulfate, copper sulfate, calcium iodate, and cobalt sulfate.