Well, here’s an animated map of obesity rates using a constant definition of “obese” (BMI of 30 or greater) covering the years 1985 to 2010:
http://www.cdc.gov/obesity/data/adult.html
It’s near the bottom so you have to scroll down some.
Unless there’s a hidden trend in the data that’s skewing people’s mass to height ratios upward, it sure looks to me like people are indeed getting fatter.
No argument there. My statement is that the definition of obesity has become so broad and wide that it no longer has the same meaning that it did a generation ago.