We ordered desserts but didn't have enough room for it after the meal, so I asked if I could take mine back to the stateroom (that was the tiramisu, not something like a soufflé which might suffer from getting cold and deflating).
Our server got the manager to come out and talk to us, and he flat out refused - saying there was no way they could allow their food to leave the dining room. Pretty much his exact words as I remembered it.
This was only a couple of weeks ago (Sep 2016) on the Fantasy.