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Prenatal maternal smoking associated with increased risk of adolescent obesity
Date:9/3/2012

CHICAGO Prenatal exposure to maternal cigarette smoking appears associated with an increased risk for adolescent obesity, and is possibly related to subtle structural variations in the brain that create a preference for eating fatty foods, according to a report published Online First by Archives of General Psychiatry, a JAMA Network publication.

"Prenatal exposure to maternal cigarette smoking is a well-established risk factor for obesity, but the underlying mechanisms are not known," the authors write as background information. "Preference for fatty foods, regulated in part by the brain reward system, may contribute to the development of obesity."

Amirreza Haghighi, M.D., of the Hospital for Sick Children, Toronto, Canada, and colleagues, studied 378 adolescents age 13 to 19 years who were recruited through high schools in one region of Quebec, Canada, as part of the ongoing Saguenay Youth Study. Participants were grouped as exposed to maternal smoking (n=180) or nonexposed to maternal smoking (n=198) and participants in each group were matched at recruitment by maternal education and participant's school attendance to minimize confounding influence of socioeconomic status (SES), and did not differ by sex, age, puberty stage or height.

The authors defined exposed as having a mother who smoked more than one cigarette a day during the second trimester of pregnancy, and nonexposed as having a mother who did not smoke one year before (and throughout) the pregnancy.

Exposed versus nonexposed participants weighed less at birth and were breastfed for shorter periods of time. At the time of analysis, exposed participants had a marginally higher body weight and BMI, and a significantly higher total body fat compared with nonexposed participants. These differences persisted after adjustment for age, sex, and height (when appropriate), and were still significant when adjusting for additional variables frequently associated
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Contact: Caitlin McNamee-Lamb
caitlin.mcnamee-lamb@sickkids.ca
416-813-7654
JAMA and Archives Journals
Source:Eurekalert

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