Best answer to this is probably, but it depends on the restaurant and may even depend on the server you happen to ask. If it's just a food preference issue some restaurants may allow adult portions of children's menu items, but some won't, you would have to ask at the restaurant. If it's a portion issue I'm not sure why an adult who will consistently order child's portions would get the dining plan, unless they're planning lots of buffets or they are traveling with a lot of people who also want the dining plan.