Die-Gest was originally conceived when a possible follow-on from Self Induced Nightmares was abandoned, during production Dan Brownlie handed the film over to Tony Newton to develop as a seperate anthology, with a food/eating theme.
Self-Induced Nightmares started life as a follow-on from 3's A Shroud called 4's A Massacre, but upon completion it was decided to release it as a standalone anthology.