I heard a theory that stories of cannibalism in South American tribes were linked to the introduction of maize to their areas- eating maize apparently creates a protein deficiency and protein cravings- and whereas before the introduction they were able to live on mostly fruit and nuts and the odd chicken, they found themselves unable to meet their own needs and turned to other sources of meat. It was also mentioned that the introduction of maize to Eastern Europe occurred around the same time as the beginnings of the Vampire myths.
(cue spooky music again!)
Love at First Bite- "Children of the Night! Shut up!"