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Samoan obesity epidemic starts at birth
Date:2/5/2013

PROVIDENCE, R.I. [Brown University] As some Pacific island cultures have "westernized" over the last several decades, among the changes has been a dramatic increase in obesity. Researchers don't understand all the reasons why, but even a decade ago in American Samoa 59 percent of men and 71 percent of women were obese. A new Brown University study finds that the Samoan epidemic of obesity may start with rapid weight gain in early infancy.

The implications of the study published online in the journal Pediatric Obesity may not be confined to Polynesian populations, said the authors. American Samoa's prevalence of obesity in infancy may be the harbinger of a slower-moving trend in the same direction in developed nations. Places like the mainland United States, after all, are the origin of the more sedentary, calorie-rich lifestyle that has largely replaced subsistence fishing and agriculture in American Samoa.

"One of the reasons we think Samoa is interesting is really because we think the level of obesity there could actually foreshadow what we see here in the United States and other high-income nations if we continue the way that we're going," said study lead author Nicola Hawley, a postdoctoral research fellow in the Alpert Medical School at Brown University and the Weight Control and Diabetes Research Center.

To conduct the study, Hawley and her co-authors examined the medical records of nearly 800 American Samoan babies born between 2001 and 2008. The babies were all singleton births, carried to term of 37-42 weeks.

In particular, the team tracked the babies' growth, weight gain, and whether they were breastfed, given formula or a mix of both. They used the data to plot the trajectories of infant weight gain up to 15 months of age.

The researchers made several main findings:

  • One in five newborns qualified for a diagnosis of macrosomia excessive birth weight of more than 8.8 pounds or
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Contact: David Orenstein
david_orenstein@brown.edu
401-863-1862
Brown University
Source:Eurekalert

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