Why cannibalism frowned upon?!

Why cannibalism frowned upon?

I always wondered what human tasted like... but i dont wanna get in trouble... why is it bad?

Cannibalism is frowned upon because of several underlying issues with cannibalism. Most people don't know what human meat taste like so it's impossible to develop a taste for human meat and enjoy it. Since people don't enjoy human meat, we don't kill each other to eat them. To perpetuate that, most cultures have mores and values against eating human meat and it was made into a sin in many religtions to really drive the point home and keep people from experimenting. Contrast that with lions in some parts of Africa that have developed a taste for human meat in the past and specifically hunt humans. In cultures where cannibalism is allowed (eating a corpse as a form of rememberance, for example), they have increased occurrences of mental diseases such as Creutzfeldt-Jakob Disease aka mad cow disease (long story short, since the human meat is exactly what we're made of, we don't break it down entirely like we do with other meat so harmful enzymes and other molecular parts don't get broken down or thrown out), as well as getting sick from whatever might have killed that person if it was an illness.