I've been told they will not starve in game-off, so even though they might show a half bar when you open the game, they will not starve themselves. They'll snack to keep from being hungry. I'm not sure if they make meals either, but it was a fix from them stuffing themselves in game-off resulting in high food consumption, which cost a lot of money to replace the next day. It also could have caused food to run empty if they kept overeating.