Obesity is an increasing problem among American adolescents, according to background information in the article. In the past 30 years, the percentage of teens aged 12 to 19 years who are obese has increased from 6 percent to more than 16 percent in 2002. The average child aged 6 to 11 also ate 133 more calories per day in 2000 than in 1990, and less than 40 percent of teens get the government-recommended hour of daily physical activity.

Kevin Patrick, M.D., M.S., of the University of California, San Diego, and colleagues assessed the effectiveness of one intervention designed to improve diet and physical activity habits among teens, the Patient-centered Assessment and Counseling for Exercise + Nutrition (PACE+) . From May 2001 through June 2002, the researchers recruited 819 adolescents between the ages of 11 and 15 years. They assigned 424 participants (222 girls and 202 boys) to a group receiving PACE+, which begins with a computer screening and goal-setting tool completed in a primary care physician's office. After a three- to five-minute counseling session with the doctor, the teen and his or her parents took home educational materials. They then received one year of personalized mailings and brief follow-up phone calls from trained research staff. A control group of 395 teens (216 girls and 179 boys) did not participate in the PACE+ program. Each group was assessed at six months and one year.

After one year, adolescents in the PACE+ program reduced their sedentary behaviors by one hour per day, while those in the other group did not. "This is important given that sedentary behaviors can decrease energy intake in nonoverweight adolescents and has been suggested as an important component of interventions to prevent obesity and regulate body weight," the authors write. Boys in the PACE+ group also increased their number of active days per week and were more likely to meet the hour daily exercise requirement, and more girls in that group met the government's guidelines for maximum percentage of daily calories from saturated fat. Since 64 percent of the teens in the PACE+ group completed at least nine of the 11 scheduled follow-up calls, the intervention is feasible, the authors report.

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