ATLANTA -- A widely reported government study that said obesity is about to overtake smoking as the No. 1 cause of death in the United States contained statistical errors and may have overstated the problem, health officials acknowledged today. The government is working on a rare correction to the study. The Centers for Disease Control and Prevention said in March in a study co-authored by its director, Dr. Julie Gerberding, that a poor diet and physical inactivity were responsible for 400,000 deaths in 2000, a 33 percent jump from 1990. However, the CDC admitted today that it made an error...