Don't Be Fooled: Soda Linked To Bad Behavior In Kids

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Guest Contributor

Back when I was on staff at The Boston Globe, I edited a story that said sugar didn’t make kids hyper. I didn’t believe it then, and a new study confirms my doubts.

Interviews with mothers of 3,000 five-year-olds from urban areas found – stunningly – that 43% of the children drank at least one soda a day, and 4% downed four or more.

out of ideas/flickr
out of ideas/flickr

The authors previously showed that adolescents were more aggressive toward others and more likely to hurt themselves the more soda they drank. The new study found pretty much the same among kindergartners:

“Those who drank soft drinks more frequently had higher scores for aggression and were more likely to destroy other people’s belongings, to get into fights and to physically attack people. Children who drank high levels of soda were more likely to exhibit withdrawn behavior and attention problems. These effects were present even after accounting for an array of socio-demographic factors and psychosocial stressors.”

It’s still unclear why or how sugar affects behavior. Studies have been contradictory, hence that long-ago story that rankled me.

“Caffeine may explain or contribute to our results,” the scientists wrote. Another possible trigger, they said, might be the food coloring in the soda (which has been found to contribute to ADHD behaviors), or perhaps low blood sugar caused both sugar cravings and aggressive behavior.

One other interesting fact: children who drank a lot of fruit juice were less aggressive, while those who ate a lot of candy showed more aggressive behaviors.

There were a few limitations to this study, as with all research. The data came from mothers, who might not have remembered their child’s exact soda consumption, or behavior. The study says nothing about cause-and-effect, just that the children who reportedly drank more soda also had more behavior problems. And the researchers didn’t look at a true cross-section of American children; kids with more social or financial advantages might not see as big an impact from soda drinking.

But the take-home message is clear: Drink water, not soda. And if your kid is acting out, try cutting back on sweets.

Karen Weintraub, a Cambridge-base health/science journalist, is a frequent contributor to CommonHealth. Follow her on Twitter @kweintraub.

This program aired on August 16, 2013. The audio for this program is not available.