The disease you are talking about is Kuru.tkioz said:snip*
http://en.wikipedia.org/wiki/Kuru_(disease)
The more you know.
Anyway its a terrible way to die.
Inspite of my previeous post I doubt I would have the willpower to eat anyone.
But that is probably due to the social conventions I have come to accept growing up where and when I did. Thus it would go the same for eating a horse, dog or cat.