Funny; this subject came up just as I was reading Martin Gardner's
latest book "Did Adam and Eve Have Navels?"
from Skeptical Inquirer columns on dubious theories
like urine therapy, numerology and intelligent design
-- and the chapter: Is cannibalism a myth?
-- basically how anthropologists' claim
of the existence of cultures that consumed humans as a consistent
source of meat could be flimsy (it was always "that other tribe
that does it").
Fun reading.
Philip Thrift "Paleofitness" http://www.paleofitness.com