Over on GTAWiki, where I used to be admin, we just said in all pages (eg. Donald Love, Morgue Party Ressurection etc.) we just said that Donald onsumee the bodies as it is implied and is thought to have happened on accounts of most fans.
In Cam pain, i thought it was obvious that Donald was feasting on the chest part of a human, he drops a rib bone on the plate and you can see it is a rib cage of a human, Toni even says 'y'know, Don, it we are going to win this thing, it's best we don't have any SKELETONS in the closet, if you know what i mean' so that is another hint right there. In the end of the mission Morgue Party Resurrection, Donald says the bodies will keep him company during the flight. It's my guess he likes to play with his food before eating it. Donald also refers to the dead bodies as 'dinner guests' but they ARE the dinner
Ugh ... Donald love has to be one of the most disturbing characters in GTA. In VC he looked just like some sort of apprentice to Avery Carrington but to then have him murder and eat him two games later. He's just strange ... I really hope he doesn't make a return in any future games.