Blessed are the ignorant
I thought it was brains in general. The causing protein only occurs in brain cells of mammals, so therefor the processing of animal heads is prohibited. After a Dioxine scandal a few years ago in Europe, rules for mixing non herbal stuff in pig and cow feed have become a lot stricter.
Fore people - Wikipedia, the free encyclopedia These people on Papua got a disease called Kuru (Creutzfeld Jakob) because they traditionally ate their deceased people, including brains...
I know of a couple that went to Africa to do development work. They only bought meat from the Islamic Halal butcher, because the average African butcher sold just about anything, including roasted mice, sick animals and roadkill. The average age they became in those countries was under 40.