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Kids Unlikely to Outgrow 'Baby Fat'

Overweight 5-year-olds face 4 times the risk of teen obesity, new research finds

WebMD News from HealthDay

By Serena Gordon

HealthDay Reporter

WEDNESDAY, Jan. 29, 2014 (HealthDay News) -- Baby fat may not be as cute as it looks, new research suggests.

Five-year-olds who carry around extra weight may face four times the risk of being obese at 14, compared to their normal-weight peers, the study found.

Of the children who became obese between the ages of 5 and 14, nearly half were overweight in kindergarten.

"We wanted to learn what are the ages of vulnerability and greater risk for new cases of obesity? We found that new cases of obesity tended to increase early on," said study author Solveig Cunningham, of Emory University in Atlanta.

In the report, published in the Jan. 30 issue of the New England Journal of Medicine, the researchers also found that socioeconomic status or ethnicity had no impact on obesity.

"Obesity affects kids across all races and socioeconomic status. Children from the wealthiest groups tended to have somewhat lower obesity risks, but the differences weren't striking," Cunningham said.

Childhood obesity in the United States is a well-documented problem, growing from 4.2 percent in 1963-1965 to 15.3 percent in 1999-2000, according to background information in the study. Recent research suggests that the rates of childhood obesity may have plateaued, but it remains a serious problem.

To better identify ways to intervene and prevent childhood obesity, Cunningham and her colleagues wanted to see whether there were times of vulnerability across a child's life span, or if certain groups had a greater risk.

To do this, they evaluated data from the Early Childhood Longitudinal Study. This study included more than 7,700 kindergartners (average age 5.6 years) from across the United States. The children's weight and height were measured at seven different times until they were in eighth grade (average age 14.1).

At the start of the study, 12.4 percent of the children were obese. Another 14.9 percent were overweight. By eighth grade, 20.8 percent were obese and 17 percent were overweight.

The annual incidence of obesity -- that is the percentage of kids who become obese each year -- went from 5.4 percent during kindergarten to 1.7 percent between fifth and eighth grade.

Although the researchers don't know for sure why the annual incidence of kids becoming obese dropped as kids got older, Cunningham theorized, "the kids who were at high risk already became obese at younger ages."

She added, "Obesity is a complex, multi-faceted issue. Our findings show that focusing on young kids is important. Many of the children were at an unhealthy weight before school. Preferences and tastes may be set in early years, so that may be one of the good places to intervene."

"Parents need to stay focused on maintaining healthy weight and increasing activity." she noted. "At young ages, the focus shouldn't be on weight loss."

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