WebMD Health News
Louise Chang, MD
June 8, 2009 -- Women who drink five or more sugar-sweetened colas per week may be more likely to develop gestational diabetes if they get pregnant, according to a new study.
The study was presented on June 6 in New Orleans at the American Diabetes Association's 69th annual scientific sessions meeting.
Data came from more than 13,400 female U.S. nurses who took part in the Nurses Health Study II. All participants had at least one pregnancy between 1991 and 2001.
While pregnant, most of the women didn't develop gestational diabetes, but 860 of the women did.
Compared to women who reported drinking less than one sugar-sweetened beverage per month, women who reported drinking five or more sugar-sweetened beverages per month were 22% more likely to report gestational diabetes. Colas were the only sugar-sweetened beverages linked to gestational diabetes.
The findings held regardless of other factors including age, race, number of previous pregnancies, physical activity, smoking, alcohol intake, BMI before pregnancy, and total calorie consumption, according to the researchers, who included Liwei Chen, MD, PhD, assistant professor at Louisiana State University's School of Public Health.
In a separate analysis, Chen's team also found that women who reported high consumption of whole fruits and "moderate" consumption of fruit juices before pregnancy were less likely to develop gestational diabetes.
Chen and colleagues aren't saying that sugary colas cause gestational diabetes, or that fruits and fruit juices prevent gestational diabetes. Observational studies like these can show associations, but not cause and effect.
The American Beverage Association, a trade group for makers of nonalcoholic drinks, issued a statement responding to the two studies.
"Gestational diabetes is a serious condition known to have many risk factors that have been identified by leading scientific bodies. Sugar-sweetened beverage consumption is not one of them," says Maureen Storey, PhD, senior vice president of science policy for the American Beverage Association.
Storey notes that the studies haven't gone through scientific peer review, haven't been published, and don't prove that drinks were to blame for gestational diabetes.
Storey advises women who are trying to conceive or who suspect they might be pregnant to consult their health care provider and to lead a healthy lifestyle. "This includes eating a variety of foods and beverages in moderation along with getting regular physical activity," says Storey.
SOURCES:American Diabetes Association 69th Annual Scientific Sessions, New Orleans, June 5-9, 2009.Statement, American Beverage Association.
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