I have taken the following snippet from: http://www.obesity.org/subs/fastfacts/obesity_US.shtml
The number of adults who are overweight or obese has continued to increase, as shown in Table 1. Currently, 64.5 percent of U.S. adults, age 20 years and older, are overweight and 30.5 percent are obese. Severe obesity prevalence is now 4.7 percent, up from 2.9 percent reported in the 1988 - 1994 National Health and Nutrition Examination Survey (NHANES) by the Centers for Disease Control and Prevention (CDC).The number of adults who are overweight or obese has continued to increase, as shown in Table 1. Currently, 64.5 percent of U.S. adults, age 20 years and older, are overweight and 30.5 percent are obese. Severe obesity prevalence is now 4.7 percent, up from 2.9 percent reported in the 1988 - 1994 National Health and Nutrition Examination Survey (NHANES) by the Centers for Disease Control and Prevention (CDC).
Table 1
Increase in Prevalence (%) of Overweight (BMI > 25),
Obesity (BMI > 30) and Severe Obesity (BMI > 40) Among U.S. Adults.Overweight
(BMI > 25)Obesity
(BMI > 30)Severe Obesity
(BMI > 40)1999 to 2000
64.5
30.5
4.7
1988 to 1994
56.0
23.0
2.9
1976 to 1980
46.0
14.4
No Data
Source: CDC, National Center for Health Statistics, National Health and Nutrition Examination Survey. Health, United States, 2002. Flegal et. al. JAMA. 2002;288:1723-7. NIH, National Heart, Lung, and Blood Institute, Clinical Guidelines on the Identification, Evaluation and Treatment of Overweight and Obesity in Adults, 1998.
So we have had close to a 50% increase in obesity in the USA. Are we genetically pre-disposed to obesity? Perhaps - but it certainly does not appear to be the the easy scapegoat obese people might want to make it into.
Jack