TUESDAY, Aug. 29 (HealthDay News) -- Adult obesity rates increased in 31 states during the past year, leaving an estimated two-thirds of Americans vulnerable to fatal diseases such as diabetes, stroke and cancer.This, despite federal and state government efforts to curb the overweight epidemic, according to a new report from the Trust for America's Health.The report, titled F as in Fat: How Obesity Policies Are Failing America, 2006, was released Tuesday and is the third in a series of annual reports by the trust detailing state obesity rates as well as the effectiveness of government policies to fight the problem.According...