Colorado is still the leanest state in the nation, but just registered the highest obesity rate in state history.

That’s not exactly something to celebrate, especially with the numbers growing.

The obesity rate here, just like the rest of the country, is going up.

The newly released "F as in Fat" report highlights the current picture of the U.S. obesity epidemic, in which about 36 percent of adults and 17 percent of children are overweight.

Specifically in Colorado, it's about 20 percent of adults.

"A lot of people come in here and they don't like to exercises, but they do it because they know it’s good for them," Pat Goldsworthy, Manager at Crossroads Fitness, said.

Goldsworthy isn't surprised by these statistics and says the increase is noticeable.

"If people would take their time and have a little better eating habits, and exercises on a regular basis they wouldn't have these issues as much as they do now days," Goldsworthy said.

He believes that if we want to see the rates decline, healthy habits need to start young.

Sandy Thies, the physical education teacher at Orchard Avenue Elementary, says, "Kids need to have a hundred and fifty minutes of activity a week in school."

That’s actually state law in Colorado under House Bill 1069.

"The idea is to get kids to be confident, competent movers so that they love activity and they love sports,” Thies said.

Some experts are questioning whether the "F as in Fat" model overstates future obesity by assuming past trends will continue in a straight line.

Regardless, Goldsworthy says promoting healthier living will never go out of style.

"Hopefully someday we can reverse the trend and start going down again," Goldsworthy said.