I was actually curious about this myself. A few days ago I put in dried cherries with all my roach species. E. chopardi, G. portentosa, A. insignis, B. dubia, N. cinerea, B. orientalis, and B. lateralis got really excited and munched away at the pieces I had given them as soon as they hit they hit their enclosures. B. atropos and B. craniifer weren't as eager to eat them, but after a few days, the cherries were gone. O. orientalis, P. fuliginosa, Panchlora sp. "Giant", O. deusta, H. fexivitta, Rhyparobia sp. "Malaysia", and G. lurida didn't seem at all interested in them. I tried with some banana chips and only the adult hissers nibbled on them. When the edges got soggy from the moisture in the substrate, some of my other roaches took some interest. They didn't last long, though. When the banana chips got soft enough, I noticed they went moldy within the next day.