Weight Gain in Older Adolescent Females: The Internet, Sleep, Coffee, and Alcohol

Objectives To examine whether excessive recreational Internet time, insufficient sleep, regular coffee consumption, or alcoholic beverages promote weight gain. Study design A longitudinal cohort of > 5000 girls (Growing Up Today Study), from all over the United States and aged 14 21 years, returned surveys in 2001 reporting typical past-year recreational Internet time, sleep, coffee (with caffeine), and alcohol consumption. We estimated correlations among these 4 exposures. Each girl also reported her height and weight in 11000 and again in 2001. Multivariate models investigated associations between I-year change in body mass index and same-year exposures, adjusted for adolescent growth/development, activity, and inactivity. Results The exposures were highly (P < .0001) correlated with each other, except for coffee with Internet time (P > .50).,lore Internet time, more alcohol, mid less sleep were ill associated (P < .05) with same-year increases in body mass index. females, aged 18+ years, who slept <= 5 hours/night (P <.01) or who consumed alcohol 2+servings/week (P <.07) gained more body mass index from 2000 to 2001. For females in weight-promoting categories of all exposures, this translates to nearly extra pounds gained over I year. We found no evidence that drinking coffee promotes weight gain. Conclusions Older girls may benefit from replacing recreational Internet time with sleep and by avoiding alcohol.