Early-life risk factors account for racial and ethnic disparities in childhood obesity...

"...most of which could be changed—appear to explain the recognized racial and ethnic disparities in the incidence of childhood overweight and obesity. In a report being published online in JAMA Pediatrics, a team of researchers report a prospective study finding that increased prevalence of obesity and overweight among black and Hispanic 7-year-olds could largely be explained by risk factors such as rapid infant weight gain, early introduction of solid foods and a lack of exclusive breast feeding...."

http://medicalxpress.com/news/2013-06-early-life-factors-account-racial-ethnic.html

See also:

The Adverse Childhood Experiences Study — the largest, most important public health study you never heard of — began in an obesity clinic

http://acestoohigh.com/2012/10/03/the-adverse-childhood-experiences-study-the-largest-most-important-public-health-study-you-never-heard-of-began-in-an-obesity-clinic/