According to the CDC, data on obesity trends shows that at least 20% of the citizens of every state in America are obese. Overall, more than a third (35.7%) of all Americans are obese. By contrast, in 1990, most states had an obesity rate of 10% or lower. These rates are highly problematic. Indeed, the World Health Organization classified obesity as an official epidemic in 1997. These two graphs show the sudden and stunning rise in the overweight population.