The National Center for Health Statistics, which tracks such things, reports that the percentage of Americans defined as obese now exceeds the percent who are just overweight, 34% as opposed to just under 33%. This means that while the prevalence of obesity (BMI >30) has doubled since 1980, the prevalence of overweight (BMI 25-29) has stayed about the same. The big are getting bigger. Some overweight people are moving into the obese category. And their places are filled by the formerly non-obese. It doesn’t look like this problem is going to go away soon.