It's said you can never be too rich or too thin, but new reseach suggests otherwise.  People who are clinically underweight face an even higher rish for dying than obese individuals, the study shows.  Compared to normal-weight folks, the excessively thin have nearly twice the risk of death, researchers concluded after reviewing more than 50 studies. (HealthDay News)  Our goal should be to be in the middle someplace: Not too heavy but not too thin.