system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can't we eat other people?

I get the moral implications, but I've heard that if you eat human flesh you can get very ill, even though we're all made of the same stuff. How does that work?
gpt
Any pathogen (whether viral, bacterial, protozoan, prion, or whatever) in your meal is going to be something that's already perfectly adapted to living in human beings. This isn't really the case with, say, fish.  That's the main problem.  Your risk isn't terribly high, but somewhat higher than it would be eating something else.