We know Seven of Nine eats after she was severed from the collective. We know the Borg drones recharge/sleep in individual docking stations. Do the Borg drones eat? If so, what do they eat, and how is it ingested?
In the TNG episode "I, Borg", Hugh was fed by absorbing energy through a port in his arm. La Forge had to install a matching coupling in the wall of Hugh's cell. The Borg implants convert energy into glucose and whatever nutrients the Borg's organic side needs to keep functioning.
Crusher : The Borg don't ingest food. Their implants can synthesise any organic molecules the biological tissues require. What they need is energy.