It has been a long time since of my own borgs starved to death. Today a mage ran out of light and was illuminating the entire dungeon with Call Light. He died resting to regain mana. Of course, he had 1 ration in the inventory.
Yesterday I told him not to junk boots in case they might be speed boots. I forgot to define unID’d boots. So the borg was carrying lots of boots [-#], since he could not sell them.