Rotten Flesh

Rotten Flesh is an item from the 1.8 update dropped from zombies. It will poison the player, but restore some of the hunger meter. As of the pre-release testing, poisoning causes no damage by itself. It is unclear whether poisening causes creatures to do increased damage to the player or not (EDIT: As of the 1.8 Leak, the poison effect causes a player to take half as much damage. It is unclear if this is a bug or an intended effect).