“If it can take in an electron at a higher energy state and excrete it at a lower energy state, charge balance is maintained.”
That statement is true so long as your talking about an electron that is already there. But if you add an electron from an external source (ie; eat it), the charge balance would not be not maintained.
Picture a wire, electrons enter one end as they leave the other. If there is nowhere for the electrons to move to, they don’t enter the wire. Probably the same for the bugs.