I did think about that, but roaches of caffeine might breed faster :evilgrin:
Not sure, they roaches they eat anything they can find, I will separate some and feed them on tea bags and watch them closely and see the out come. I feed my roaches sugar, popcorn with salt , some crisps even cup cakes, my daughter normally licks the ice sugar off and leave the cake behind the roaches get it.
Even bandannas.
They even drink milk!
The only thing that I find that kills them is pasta,