Hmm, we're on brown rice at home... But on whites during office hours. I typically prefer soupy noodles myself. Have no idea why pasta would be better than rice, we are talking about wheat flour here aren't we?
It has to do with glycemic index: how quickly a particular food , once in your GI tract, dumps sugar into your bloodstream. Clearly, slower more sustained release is better. Complex carbs are very good. Sweet potatoes much better than regular potatoes. Easy to find plenty of online resources.