...and, i just seem to have shit out some capsicum seeds. how 'bout that.
i didn't do a thorough survey, but, by eyeing it, i'd say the seeds came out at about 20% of the volume they came in at. so, i guess there's some chance that my stomach sucked out the good parts and spat out the cellulose, but it seems to be more likely that it just couldn't do much with them, and any shrinkage is just from acidification.
so, i'll try grinding them next time and see what happens.