When children eat what they watch: impact of television viewing on dietary intake in youth.
OBJECTIVE
To test whether increased television viewing is associated with increased total energy intake and with increased consumption of foods commonly advertised on television, and to test whether increased consumption of these foods mediates the relationship between television viewing and total energy intake.


METHODS
Prospective observational study with baseline (fall 1995) and follow-up (spring 1997) measures of youth diet, physical activity, and television viewing. We used food advertising data to identify 6 food groups for study (sweet baked snacks, candy, fried potatoes, main courses commonly served as fast food, salty snacks, and sugar-sweetened beverages).


METHODS
Five public schools in 4 communities near Boston. The sample included 548 students (mean age at baseline, 11.70 years; 48.4% female; and 63.5% white).


METHODS
Change in total energy intake and intake of foods commonly advertised on television from baseline to follow-up.


RESULTS
After adjusting for baseline covariates, each hour increase in television viewing was associated with an additional 167 kcal/d (95% confidence interval, 136-198 kcal/d; P<.001) and with increases in the consumption of foods commonly advertised on television. Including changes in intakes of these foods in regression models provided evidence of their mediating role, diminishing or rendering nonsignificant the associations between change in television viewing and change in total energy intake.


CONCLUSIONS
Increases in television viewing are associated with increased calorie intake among youth. This association is mediated by increasing consumption of calorie-dense low-nutrient foods frequently advertised on television.
Wiecha
Jean L
JL
Departments of Society, Human Development, and Health, Harvard School of Public Health, 677 Huntington Avenue, Boston, MA 02115, USA. jwiecha@hsph.harvard.edu
Peterson
Karen E
KE
Ludwig
David S
DS
Kim
Juhee
J
Sobol
Arthur
A
Gortmaker
Steven L
SL
D000329:Advertising; D001900:Boston / Q000453:epidemiology; D002648:Child; D015986:Confounding Factors, Epidemiologic; D002149:Energy Intake; D005247:Feeding Behavior; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D009043:Motor Activity; D011446:Prospective Studies; D013690:Television / Q000706:statistics & numerical data