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Summary Objective There is a paucity of prospective research exploring the relationship among contemporary screen time modalities (e.g., video streaming, video chatting, texting and social networking) and body mass index (BMI) percentile. The objective of this study was to determine the prospective associations between screen time behaviours in a large and demographically diverse population‐based cohort of 9–10‐year‐old children and BMI percentile at 1‐year follow‐up. Methods We analyzed prospective cohort data from the Adolescent Brain Cognitive Development (ABCD) Study (N = 11 066). Multiple linear regression analyses were conducted to estimate associations between baseline screen time behaviours (exposure) and BMI percentile at 1‐year follow‐up, adjusting for race/ethnicity, sex, household income, parent education, depression, binge‐eating disorder and baseline BMI percentile. Results Each additional hour of total screen time per day was prospectively associated with a 0.22 higher BMI percentile at 1‐year follow‐up (95% CI 0.10–0.34) after adjusting for covariates. When examining specific screen time behaviours, each additional hour of texting (B = 0.92, 95% CI 0.29–1.55), video chat (B = 0.72, 95% CI 0.09–1.36) and video games (B = 0.42, 95% CI 0.06–0.78) was significantly prospectively associated with higher BMI percentile. Conclusions Screen time is prospectively associated with a higher BMI percentile 1 year later among children 9–10 years old.

ObjectiveTo determine the prospective associations between contemporary screen time modalities in a nationally representative cohort of 9–10‐year‐old children and binge‐eating disorder at one‐year follow‐up.MethodWe analyzed prospective cohort data from the Adolescent Brain Cognitive Development (ABCD) Study (N = 11,025). Logistic regression analyses were conducted to estimate associations between baseline child‐reported screen time (exposure) and parent‐reported binge‐eating disorder based on the Kiddie Schedule for Affective Disorders and Schizophrenia (KSADS‐5, outcome) at one‐year follow‐up, adjusting for race/ethnicity, sex, household income, parent education, BMI percentile, site, and baseline binge‐eating disorder.ResultsEach additional hour of total screen time per day was prospectively associated with 1.11 higher odds of binge‐eating disorder at 1‐year follow‐up (95% CI 1.05–1.18) after adjusting for covariates. In particular, each additional hour of social networking (aOR 1.62, 95% CI 1.18–2.22), texting (aOR 1.40, 95% CI 1.08–1.82), and watching/streaming television shows/movies (aOR 1.39, 95% CI 1.14–1.69) was significantly associated with binge‐eating disorder.DiscussionClinicians should assess screen time usage and binge eating in children and adolescents and advise parents about the potential risks associated with excessive screen time.