The study provides the latest national estimates of childhood and adult obesity in the United States, analyzing trends from 2003 to 2012. In 2011-2012, 8.1% of infants and toddlers had high weight for recumbent length, 16.9% of 2- to 19-year-olds were obese, and 34.9% of adults aged 20 years or older were obese. Overall, there was no significant change in obesity prevalence from 2003-2004 to 2011-2012. However, there was a significant decrease in obesity among 2- to 5-year-old children (from 13.9% to 8.4%) and an increase in obesity among women aged 60 years and older (from 31.5% to 38.1%). The study highlights the continued high prevalence of obesity and the need for ongoing surveillance.The study provides the latest national estimates of childhood and adult obesity in the United States, analyzing trends from 2003 to 2012. In 2011-2012, 8.1% of infants and toddlers had high weight for recumbent length, 16.9% of 2- to 19-year-olds were obese, and 34.9% of adults aged 20 years or older were obese. Overall, there was no significant change in obesity prevalence from 2003-2004 to 2011-2012. However, there was a significant decrease in obesity among 2- to 5-year-old children (from 13.9% to 8.4%) and an increase in obesity among women aged 60 years and older (from 31.5% to 38.1%). The study highlights the continued high prevalence of obesity and the need for ongoing surveillance.