Futurama Wiki says:(Dark matter) is the densest, and therefore heaviest, substance in the universe, with each ball that Nibbler produces weighing as much as 1000 suns.
Professor Farnsworth says dark matter is so dense that
"each pound of it weighs over ten thousand pounds."
Nibbler himself admits
"We live long and are celebrated poopers"
He has an enormous appetite. How much food does Nibbler require in order to produce one of his dense 1 pound=10,000 pounds power packed pellets of dark matter?