By Katie Kerwin McCrimmon Colorados adult obesity levels recently jumped at the second-fastest rate in the country, a disturbing increase for a state that has long bragged of being the leanest in the nation. Its not good news. If anything, its even more of a wake-up call. One of the things we know about obesity is its much easier to prevent than to reverse it. Weve got the opportunity to use prevention in Colorado. Were going to rapidly lose that, said James O. Hill, director of the Colorado Center for Health and Wellness at the University of Colorado Anschutz Medical…