For parents, that means that it's even more important to monitor added sugars in kids' diets, even those that aren't so obvious.
"Added sugars are in sugar sweetened cereals, muffins -- even pasta sauce," said Cynthia Ogden, the study's co-author and an epidemiologist with the Centers for Disease Control and Prevention. "You can see it if you read the food labels."
The report, which tracked consumption of added sugars by children and teens from 2005 to 2008, offered other unexpected findings, said Ogden.
Researchers also found that family income made no difference in children's sugary diets.
"We found that all kids are eating a lot of added sugars," she said.
For more on this issue, read High Chair Times' take on whether sugar should be regulated as a toxin.
Image: Sugary cereal, via Shutterstock.