The adult obesity rate in Oklahoma goes up by about 10 percent a decade. The state now has the sixth highest in the U.S., according to The State of Obesity, with 33 percent of people over 18 being obese, compared to 20.1 percent in 2000 and from 10.3 percent in 1990. The state is sixth in terms of high school obesity, 17.9 percent, even though it went down from 16.7 percent in 2011 to 11.8 in two years.