Cannibalism Normal For Early Humans?

Cannibalism Normal For Early Humans?:

"Scientists from England, Australia, and Papua New Guinea say that cannibalism is the most likely explanation for their discovery that genes protecting against brain diseases that can be contracted by eating contaminated flesh have long been spread throughout the world.

A growing body of evidence, such as piles of human bones with clear signs of human butchery, suggests cannibalism was widespread among ancient cultures. The discovery of this genetic resistance, which shows signs of having spread as a result of natural selection, supports the physical evidence for cannibalism, say the scientists

The brain diseases, called prion diseases, are characterized by loss of coordination, dementia, paralysis, and eventually death. Modern examples include Creutzfeld Jacob disease and kuru in humans and mad cow disease, or bovine spongiform encephalopathy, in animals."

http://news.nationalgeographic.com/news/2003/04/0410_030410_cannibal.html