Fun fact: This is pretty much a myth! There is only one case of a prion disease being transmitted via cannibalism in humans - Kuru. It's only contracted by consuming the brain matter of an infected individual, and it's only ever occurred in one group - the Fore people of Papua New Guinea, who practiced funerary cannibalism. It's been eradicated since 2009.

The danger of contracting a prion gets trotted out all the time as justification for cannibalism being bad/wrong, and it just isn't a factor. The truth is that human cannibalism is, except for one single (and incredibly tragic, so many child deaths resulted from this freak outbreak) instance, fine. And avoiding the consumption of brain tissue mitigates even that one impossibly rare risk.