Your argument is not completely, invalid, however.
From the CDC:
Quote:
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HANES III and NHANES 1999-2002 used a stratified, multistage, probability sample of the civilian, U.S. noninstitutionalized population. A household interview and a physical examination were conducted for each survey participant. During the physical examination, conducted in mobile examination centers, height and weight were measured as part of a more comprehensive set of body measurements. These measures were taken by trained health technicians, using standardized measuring procedures and equipment. Observations for pregnant women and for persons missing a valid height or weight measurement were not included in the data analysis.
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It seems they developed these experiments in a controlled fashion, but their statistical analysis truly falls apart because of their sample size. In the NHANES 1999-2002 study that they use to present the conclusion that 65% of America is obese, they used a sample size of 8,505 participants. Its a decent sample size, but it likely has a
very weak correlative relationship with the 295-299 million people inhabiting the US.
So, two points -- your city is probably not indicative of the true normalized average of obesity, but neither is the CDC's estimation.