The Beginning Was the End claimed that modern humans
devolved from a species of brain-eating
apes.
[3] According to Maerth, this diet increased the apes' brain size,
sex drive, and aggression, but suppressed their purported innate
psychic ability, eventually causing
insanity.
[1] Maerth offered no evidence for his theories, basing them largely on his alleged meetings with
cannibals in
Java and
New Guinea[4] and his experiences eating raw
ape brains in a restaurant in
Southeast Asia. He hints at having activated his latent psychic abilities through altering the shape of his skull in the manner of
Incan tribes and/or
trepanation, and his theories claimed to be mostly derived from the resulting divine inspiration.