Cannibal (Fallout 4)

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

Background
The perk has three ranks. The first rank allows human corpses to be eaten by the player, the second rank adds ghouls and Super Mutants to the menu, and the third rank increases restored Hit Points. Unlike the Karma system from previous games, a companion's affinity toward the Sole Survivor is directly influenced by witnessing the act. In addition, eating corpses in Survival mode may lead to an addiction called Dark Craving where only eating corpses satisfies hunger.

Effects
Restore Hit Points by eating corpses.

Companions
Most companions, except for Strong, Dogmeat, Codsworth and Gage, dislike witnessing the Sole Survivor eating a corpse. Hancock, X6-88, Curie and MacCready comment negatively on it, though their affinities are not affected.

Survivor Mode
In Survival mode, the perk can be used to satisfy the hunger, but it inflicts the player character with the Dark Craving status effect. Regular food does no longer sate hunger, making the player character reliant of feeding on corpses. In addition, food needs will go from well-fed to ravenous directly, without any intermediate statuses. The Sole Survivor will stay satisfied for 12 game hours before needing to feed again on another corpse, where as one normally needs to eat every 6 game hours. One corpse will take the Sole Survivor from ravenous to well-fed.

Companion reactions
Nearly all companions will react to the Sole Survivor eating human, ghoul or super mutant flesh.