Answer:
The same thing that happens when you eat chicken or beef, you digest it and eventually leave it in a porcelain throne. As long as you avoid the brain that is, prion diseases are nasty.
Psychologically the effects may vary depending on how OK you are eating someone, personally I would experience some problems and feel disgust.
Source: https://www.quora.com/What-happens-i...ats-human-meat
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