I don't have a complete answer, but one book I read on vermiculture said
that peat moss soaked with vegetable oil is a maintenance food for African
worms in fishing bait shops, so I guess the worms just eat vegetable oil and
digest it.

"Alan Horowitz" wrote in message
om...
people who use Xenical excrete undigested vegetable oils and animal
fats.

how diluted (with shredded wood, peat moss, etc) need this be, to not
harm the earthworms in a composting toilet?