MINNEAPOLIS — If you want your overweight teenagers to slim down, whatever you do, don’t tell them to go on a diet. That most likely will make matters worse, according to a new study.
University of Minnesota researchers who study adolescent health found that parents who correctly perceived their kids as overweight tended to use only one strategy — advising them to diet. But five years later, those kids were far more likely to still be too heavy than were overweight kids whose parents had no idea they were fat and did nothing.
In short, it’s a technique that seems certain to backfire, said Dianne Neumark-Sztainer, a professor of epidemiology at the university and the lead author of the study published Monday in the journal Pediatrics.
“My concern is that if parents know their kids are overweight, they are going to do things that lead to further weight gain over time,” she said.
Neumark-Sztainer said she decided to research the issue because of the growing practice of schools evaluating kids’ weight and sending the results home to parents. In some places it’s called an obesity report card. It began because parents often don’t know whether their kids are at a healthy weight, and some experts believe telling them is one way to fight skyrocketing rates of childhood obesity.
Neumark-Sztainer said she wanted to find out whether parents would use that information wisely.
She and her co-researchers looked at survey results for 300 adolescents and some of their parents taken in 1998 as part of an ongoing adolescent health study at the university called Project EAT. The kids, all from Minnesota middle and high schools, reported heights and weights that put them in the overweight category.
They found that 46 percent of girls’ parents and 60 percent of boys’ parents incorrectly thought their kids’ weights were about right. Of the parents who knew their kids were too heavy, about 60 percent encouraged them to diet.
Five years later, about 200 of the kids were surveyed again. Those who had been encouraged to diet were much more likely to still be overweight — about 74 percent of boys compared with 52 percent of those boys not encouraged to diet. For girls, the difference was 66 and 44 percent, respectively.
Both groups reported about the same eating patterns, including the frequency of fast food meals, and the quantity of fruits and vegetables at home.
“If you are going to talk with parents about their children’s weight, you need to specifically help them make positive changes at home,” said Neumark-Sztainer, who has written a book for parents on the subject called “I’m Like So Fat.”
Anne Fletcher, author of “Weight Loss Confidential,” said that when she talked to teenagers for her book, they said the worst thing their parents could do was pressure them.
“Nagging, preaching, coercion does not work,” she said. “Let the kid be in charge. It’s up to the teen to decide if and how he or she wants to lose weight.”
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