I tried eating a different food, in this case cooked chicken, and i got a warning almost immediately. Vanilla Minecraft... default texture pack... latest version of Mac Java... nothing that should cause problems. EDIT: Now I have been kicked, had my health drop down to a half heart, and even after eating up to a full health bar I don't heal. After logging out and back in (or getting kicked) the food bar reverts to the state it was in a while back (one food thingy). EDIT 2: My food bar dropped down to on food thing while typing my last edit.