To cannibalize or not to cannibalize?

I reference the apocalypse often.  Not the apocalypse mentioned in the Bible, but the real possibility that someday, governments will collapse as a result of a manmade or natural disaster (or zombie invasion) and human beings will find themselves living in the Stone Age again.

While I am not looking forward to this day, I am prepared for it and will be ruthless about my survival.  I've already chosen the people with whom I will band together, and many close friends and family are excluded...