On a regional basis, the south had the highest prevalence of adult obesity at 29.5%, followed by the Midwest (29%), the Northeast (25.3%) and the West (24.3%).
The C.D.C. said changes in the 2011 B.R.F.S.S. survey methodology means the results should not be compared to past B.R.F.S.S. surveys. Specifically, the C.D.C. incorporated cell phone-only households into the survey and added a new weighting process to ensure that the sample better represent the population in each state.
