Cannibal

Cannibal is a Fallout 3 Perk.
 * Requirements: Level 12
 * Ranks: 1
 * Benefit: With the Cannibal perk, when you’re in Sneak mode, you gain the option to eat a corpse to regain Health. But every time you feed, you lose Karma, and if the act is witnessed, it is considered a crime against nature.

Other Effects (Possible Spoilers).

Allows for expanded dialogue options when speaking with The Family in the Blood Ties quest.