Fred has eaten full sized adults for a while now, since he was bout 12 inches. his bite has massive power and he cuts them clean in half with two bites (actually almost took my fingertip off yesterday haha) it comes down to how your individual beardie eats. Fred has always chewed up his food really well so ive given him supers, mealworms, wild caught lizards and baby birds (fallen out of nests). he's never had a problem eating. it comes down to your comfort level, let him have a larger one and see how he eats it, make sure his temperatures are nice and hot so he can digest it well and you should be ok.