According to a study done in 2003-2004, the prevalence of obesity for adults in the United States compared with the results found in the same study done in 1976-1980 (30 seconds)

Has risen to 32.9% from a value of 15.0% in the 1976-1980 study.
Has risen to 42.9% from a value of 25.0% in the 1976-1980 study.
Has stayed steady at 25%.
Has fallen to 15% from 25% in the 1976-1980 study.
Has stayed steady at 32.9%.