Cannibal (Fallout: New Vegas)

Cannibal, called Mystic Power in the Japanese version, is a perk $$

Effects
The perk has one rank and requires the Courier to be level four or above. It allows them to feed on the corpses of both humans and non-feral ghouls, and with the Old World Blues add-on, additionally on the corpses inside the Y-17 Trauma Override Harnesses. After consuming 25 corpses, the Courier will acquire the Dine and Dash challenge perk, allowing them to harvest human remains from a corpse, rather than eating it directly.

Each corpse consumed grants +25 Hit Points, +3 Radiation and -1 Karma, and in Hardcore Mode, -25 Starvation. If the act is witnessed by friendly non-player characters, they will become hostile. However, companions do not turn hostile.