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Soda drinking tied to kids' behavior problems: study

Children of the Kosovo Ashkalli minority drink during a ribbon-cutting ceremony for their new home in the village of Magure in central Kosov
Children of the Kosovo Ashkalli minority drink during a ribbon-cutting ceremony for their new home in the village of Magure in central Kosov

By Andrew M. Seaman

NEW YORK (Reuters Health) - Children who drink soda tend to score slightly higher on scales that measure aggressive behavior than kids who don't drink the carbonated beverages, according to a new study.

The study's lead author cautioned, however, that the increase may not be noticeable for individual children and the researchers can't prove soda caused the bad behaviors.

"It's a little hard to interpret it. It's not quite clinically significant," Shakira Suglia, of Columbia University's Mailman School of Public Health in New York, told Reuters Health.

Previous work by some of the study's authors had found connections between soda drinking and violent behavior, but the link had not been studied in young children.

For the new analysis, the researchers used an existing study of mothers and their 2,929 children from 20 large U.S. cities. The mothers and children were first recruited between 1998 and 2000 to be periodically interviewed and evaluated.

Mothers completed a checklist on children's behaviors over the previous two months to measure withdrawal, attention and aggression.

"It's things like how often does a child destroy his or her own belongings and how often do they destroy the belongings of others," Suglia said.

The mothers were also asked how many servings of soda their children drank per day and about other habits such as TV watching.

Overall, 43 percent of the kids drank at least one soda per day and 4 percent drank four or more servings.

Aggressive behavior was measured on a scale between 0 and 100 - with higher scores indicating more aggression. Suglia said the average score is 50, and 65 is usually used as a clinical marker of when children should be evaluated for a problem.

Kids who reportedly drank no soda scored 56 on the aggression scale, on average. That compared to 57 among kids who drank one serving per day, 58 among those who drank two servings, 59 among those who drank three servings and 62 for four soda servings or more per day.

After taking into account habits that may have influenced the results - such as how much TV the kids watched, how much candy they ate and their mother's race and education - the researchers still found that drinking two or four or more servings of soda per day was tied to higher aggression scores.

Overall, kids who drank four or more servings of soda per day were twice as likely to destroy other people's belongings, get into fights and physically attack people, compared to children who didn't drink soda.

Soda drinkers also scored higher on scales measuring signs of withdrawal and attention problems, write the researchers in The Journal of Pediatrics.

Suglia said that although the increased aggressive behavior may not be noticeable for each child, it's moving all kids closer to the scale's clinical threshold.

"Furthermore, if they're drinking this much soda, it's probably taking away from other nutritional things the child could be eating," she said.

The researchers write that they can't tell from their study what may explain the association between soda and behavior problems in children, but one possibility is that an ingredient in soda - like caffeine or high fructose corn syrup - could directly increase aggression.

Another possibility, however, is that an underlying condition - such as low blood sugar - could make kids more aggressive and make them crave soda and sweets, they add.

Suglia also said it's important to note that the results may not apply to the general population, because most of the mothers were single and African American or Latina.

Despite those limitations, Janet Fischel, director of developmental and behavioral pediatrics in the department of pediatrics at Stony Brook University School of Medicine in New York, said the study is a step in the right direction.

"I think it's really important and a giant first step in gathering an evidence base for what's becoming a very widespread dietary habit. I think that's really important," Fischel, who wasn't involved in the new study, said.

SOURCE: http://bit.ly/1a8e2GA The Journal of Pediatrics, online August 16, 2013.

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