EWTN Catholic Q&A
Question from Michael S. on 01-21-2001:

Is cannibalism an evil in itself? If so, why? I know some people have resorted to cannibalism to stave off death. Is that sinful?

Answer by Fr.Stephen F. Torraco on 01-21-2001:

Cannibalism is indeed a serious evil when this practice is deliberately pursued. As such, cannibalism is the ultimate example of the evil of reducing a human person to a means to an end. In the extreme case of the danger of death because of hunger, we have, not a deliberate pursuit as a regular practice, but rather, assuming that persons involved die of natural causes and are not murdered for the sake of consuming them, a morally justified measure in an extreme emergency.