...The Centers for Disease Control has acknowledged that an earlier study inflated the number of obesity-related deaths in the U.S. It turns out that obesity isn't on track to overtake smoking as the nation's No. 1 cause of preventable deaths, or at least not anytime soon. A widely cited CDC study released in March said the number of deaths tied to physical inactivity and poor diet increased by 100,000, or 33%, between 1990 and 2000. Now the government says those numbers are way off due to faulty methodology, and it plans to revise the figures downward. Internal CDC documents reviewed...