I agree with Macmom111 on this one. The food would have to have been extremely poisonous for here to eat it and suddenly become so ill that he was unresponsive. It could have been a food allergy that he did not know he had. He should indeed see a doctor. It takes a while for a stomach virus to manifest itself, certainly longer than the time it took to eat a breakfast.
(Not that it could not have been something he ate earlier in the cruise or even possibly before he got on the ship)
I have never had bad food on a Carnival cruise. In fact I thought the food on Carnival was better than on our RCI cruise (but not by much). I guess you were unlucky in getting get some under cooked food on your cruise. That's a shame and I would think that Carnival would have followed up with you by now.
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007