The Sword of Truth
Terry Goodkind's The Sword of Truth fantasy series features the Mud People, a wild tribe which consumes the dried meat of their enemies before important events and rituals, believing it a way of gaining the enemies' wisdom. The Mud People were known to sometimes receive visions about the intentions of the victims and their people, and Richard himself received such a vision during one of the times he had to eat human flesh in order to participate in such an event. Kahlan, aware of that custom, pretended to be a vegetarian whenever visiting the tribe.