Two words: bio accumulation. An adult human is full of toxins.
And prions.
for those of us who want to know: https://www.britannica.com/science/prion-infectious-agent
Yep. They build up in your body your whole life, but chances are they won't reach a dangerous level before you die. If you start eating human nervous tissue on the other hand you might be in trouble. Same goes for nervous tissue from animals which have a partially carnivorous diet, such as cattle being fed beef offal. That's how BSE happened.
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