With Ghastly Scavenger, when you're in Sneak mode, you gain the option to eat a super mutant or feral ghoul corpse to regain health. Every time you feed, you lose Karma, and if the act is witnessed, it is considered a crime against nature.
Each corpse you consume restores 50 points of your health, adds 5 Rads, and subtracts one Karma.
Ghastly Scavenger is unaffected by the Dine and Dash perk.
Since all of the characters that must be eaten in order to obtain the Meat of Champions perk are humans, this perk is not needed to do so.
Despite being "ghastly," the ghost people of the Sierra Madre cannot be eaten.
You gain a unique dialogue option with Jas Wilkins if you have this perk.