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Last Updated: Nov 18, 2006 - 12:32:53 PM

Paediatrics Channel
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Latest Research : Paediatrics

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Twenty-two-year study shows that young kids are now more likely to be overweight
Aug 10, 2006 - 3:10:00 PM, Reviewed by: Dr. Anita Dhanrajani

"These results show that efforts to prevent obesity must start at the earliest stages of human development, even before birth,"

 
By examining more than 120,000 children under age 6 in Massachusetts over 22 years, a newly published study shows that young children--especially infants--are now more likely to be overweight. This study was based at the Department of Ambulatory Care and Prevention of Harvard Medical School and Harvard Pilgrim Health Care and appears in the July issue of Obesity.

"The obesity epidemic has spared no age group, even our youngest children," says Matthew Gillman, MD, senior author of the study and associate professor in the Department of Ambulatory Care and Prevention (of Harvard Medical School and Harvard Pilgrim Health Care).

Over the course of the study, the prevalence of overweight children increased from 6.3 percent to 10 percent, a 59 percent jump (based on weight and height measures documented in medical records). The proportion of children at risk of becoming overweight grew from 11.1 percent to 14.4 percent overall, a 30 percent jump.

Infants from birth to six months of age, an age group seldom studied before, had particularly surprising results. Of all the age groups studied, these infants had the greatest jump in risk of becoming overweight, at 59 percent, and the number of overweight infants increased by 74 percent. "This information is important to public health because previous studies show that accelerated weight gain in the first few months after birth is associated with obesity later in life," says Gillman.

According to the Centers for Disease Control and Prevention's national reference data, children with a weight-for-height index between the national 85th and 95th percentiles for age and gender are classified as at risk for becoming overweight, and those with a weight-for-height index greater than the 95th percentile are classified as overweight. Access the CDC's growth charts at http://www.cdc.gov/growthcharts/.

"In addition to demonstrating that we are seeing more heavy infants today than we did 20 years ago, this study illustrates the usefulness of routinely collected information from doctors' offices to address a key public health issue," says Juhee Kim, PhD, first author of the study. Kim performed this research at DACP while she was a research fellow in the Public Health Nutrition Program at the Harvard School of Public Health.

Gillman and colleagues collected data from well-child visits among more than 120,000 children younger than 6 years old at 14 Harvard Vanguard Medical Associates practices in eastern Massachusetts from 1980 through 2001. All of the children were enrolled in an HMO, which, throughout the study, used a completely electronic medical record system that contained demographic and growth data for the children.

"These results show that efforts to prevent obesity must start at the earliest stages of human development, even before birth," says Gillman. "These efforts should include avoiding smoking and excessive weight gain during pregnancy, preventing gestational diabetes, and promoting breastfeeding, all of which researchers have shown to be associated with reductions in childhood overweight."
 

- July issue of Obesity
 

hms.harvard.edu

 
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This study was supported in part by grants from the Centers for Disease Control and Prevention, the National Institutes of Health, the Seiden-Denny Scholarship fund for Maternal and Child Health, Harvard School of Public Health, the Berkowitz Fellowship in Public Health Nutrition, the Harvard Pilgrim Health Care Foundation, and Harvard Medical School.

Harvard Medical School has more than 7,000 full-time faculty working in eight academic departments based at the School's Boston quadrangle or in one of 47 academic departments at 18 Harvard teaching hospitals and research institutes. Those Harvard hospitals and research institutions include Beth Israel Deaconess Medical Center, Brigham and Women's Hospital, Cambridge Health Alliance, The CBR Institute for Biomedical Research, Children's Hospital Boston, Dana-Farber Cancer Institute, Forsyth Institute, Harvard Pilgrim Health Care, Joslin Diabetes Center, Judge Baker Children's Center, Massachusetts Eye and Ear Infirmary, Massachusetts General Hospital, Massachusetts Mental Health Center, McLean Hospital, Mount Auburn Hospital, Schepens Eye Research Institute, Spaulding Rehabilitation Hospital, VA Boston Healthcare System.


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