From a caloric perspective, a person turns out to be an average meal. The key problem, however, lies elsewhere: the risk of infection. Pathogens have an easier task because they end up in an organism with almost identical physiology. The risk of disease rises exponentially when cannibals consume other cannibals, as even cooking does not eliminate prions, or misfolded proteins, that can cause fatal neurological diseases. One of these, kuru, was once common among the Fore people of Papua New Guinea, who cooked and ate their deceased relatives, believing they were freeing the spirit of the dead person. The researchers said these risks probably contributed to the emergence of one of humanity's strongest taboos, which was based at least in part on its protective function. Taboo acts as an evolutionary safeguard. Communities that didn't curb cannibalism simply didn't survive.
what exactly is in a poutine?
https://www.ctvnews.ca/sci-tech/article/cannibalism-is-bad-for-your-health-scientists-find/
Cannibalism is bad for your health, scientists find