Most people don't gut load them because they have so much calcium but you can it just gets nasty. Plus if you gutload they become much bigger and are therefore more filling and more nutritious. Depending on how many you have you can put about 50 in a coffee can and then put any normal gutload fruits and vegetables and they will devour them. Nasty part comes in digging them out of the rotting fruits and veggies. See my pic for an idea, these are in my 5 gallon composter where I breed them.