I've been told by a Chinese friend of mine that you should never reheat rice, but even he couldn't give me any more information as to why. I think there's some sort of time factor involved here - If you're planning to reheat a rice meal not long after it's been cooked, let's say a couple of hours, then it should be ok, but like mentioned before, make sure it's piping hot. - But if it's been cold for 24 hours or so, then you'd be better off eating the rice cold. That's what i do, and it's never made me ill.