Research involving a former brain-eating tribe from Papua New Guinea is helping scientists better understand mad cow disease and other so-called prion conditions and may also offer insights into Parkinson's and dementia.

People of the Fore tribe, studied by scientists from Britain and Papua New Guinea, have developed genetic resistance to a mad cow-like disease called kuru, which was spread mostly by the now-abandoned ritual of eating relatives' brains at funerals.

Experts say the cannibalistic practice led to a major epidemic of kuru prion disease among the Fore people, which at its height in the late 1950s caused the death of up to 2 percent of the population each year.