The study found specific antibodies were detected in 22 percent of obese children in the test group. Only 7 percent of those whose weight was in the normal range had those same antibodies.
Obesity among young people has tripled within the past 3 decades.
Experts say over-eating and a lack of exercise are clearly associated with obesity, but other factors could also play a role. The study was released in the October issue of Pediatrics.