Ads for unhealthy foods may explain link between television viewing and overweight in children

Boston, MA -- Researchers from the Harvard School of Public Health (HSPH) and Children's Hospital Boston found that kids who spend more time watching television also eat more of the calorie-dense, low-nutrient foods advertised on television. Previous studies had demonstrated that children who watch more television are more likely to be overweight, but this is the first time a research team has found evidence for a mechanism explaining that relationship. The study results appear in the April 2006 issue of the Archives of Pediatric and Adolescent Medicine.

"We've known for a long time that television viewing is a risk factor for overweight, though the common perception is that this is due to the fact that it's a sedentary use of time," said Jean Wiecha, the study's lead author and a senior research scientist at HSPH. "This study provides evidence that television is effective in getting kids to eat the foods that are advertised, and this drives up their total calorie intake."

Wiecha and her colleagues collected baseline data on dietary patterns and television viewing habits for 548 Boston-area students in sixth and seventh grade and then repeated these measurements 19 months later. When surveying the students about their food intake, the researchers asked specifically about snacks and beverages commonly advertised on television, such as soda, chips, fast food and baked snacks like cookies. Students were also asked to estimate the number of hours spent watching television each day of the week.

The results of the study showed that each hour of increased television viewing over baseline was associated with a total energy increase of 167 calories -- just about the amount of calories in a soda or a handful of snack food, said Wiecha. Each additional hour of television viewing was also independently associated with increased consumption of foods commonly advertised on television, and these foods were shown to be responsible for much of the calorie inc

Contact: Robin Herman
Harvard School of Public Health

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