Peer-reviewed article
The Association Between Daily Screen Time and Childhood Overweight and Obesity: Current Evidence and Potential Mechanisms.
Lu L, Gu Y, Yang W, Liang Z ·
Summary
Written by AI, not yet AICS's view · claude-haiku-4-5-20251001This narrative review examines the relationship between daily screen time and childhood overweight and obesity across multiple studies published between 2005 and 2026. The evidence shows that prolonged screen exposure through television, smartphones, tablets, and computers is associated with increased risk of weight-related health problems in children, though the strength of association varies by age group and screen type. The review identifies potential mechanisms including reduced physical activity, exposure to unhealthy food marketing, disrupted sleep, and metabolic effects. Most evidence comes from observational research, limiting causal conclusions, and the review recommends interventions involving parental guidance, school policies, and public health initiatives.
Key points
- Prolonged screen engagement is associated with elevated risk of childhood overweight and obesity across multiple device types
- The strength and consistency of the association varies across age groups, screen modalities, and study designs
- Most evidence derives from observational research, precluding definitive causal inference
- Proposed mechanisms include sedentary behavior displacing physical activity, unhealthy food marketing exposure, disrupted sleep patterns, and metabolic effects
- Recommended interventions include parental guidance, school-based policies, and public health initiatives
Limitations
This is a narrative review that synthesizes existing evidence rather than conducting original research, so it cannot provide new empirical data. The review acknowledges that most included evidence is observational and cross-sectional, which limits causal inference, and the mechanisms linking screen time to obesity are presented as proposed rather than definitively established.
Abstract
In recent decades, the widespread adoption of digital devices has led to a dramatic increase in screen time among children, raising significant public health concerns. This narrative review synthesizes current evidence on the relationship between daily screen exposure and the rising prevalence of childhood overweight and obesity. Childhood overweight and obesity are established risk factors for children's mental health problems in the short term and for the occurrence and development of various chronic diseases in adulthood. We searched PubMed, Web of Science, and Scopus for observational and intervention studies published in English between 2005 and 2026, using combinations of the terms "screen time", "television", "video games", "social media", "children", "adolescents", "overweight", and "obesity". Mounting evidence suggests that prolonged engagement with screens whether through television, smartphones, tablets, or computers is associated with to an elevated risk of weight-related health issues in children. However, the strength and consistency of this association vary across age groups, screen modalities, and study designs, with much of the evidence deriving from observational research that precludes definitive causal inference. Our review evaluates existing literature, encompassing recent empirical findings, theoretical perspectives, and proposed mechanistic pathways underlying this association. Key factors under examination include sedentary behavior displacing physical activity, exposure to unhealthy food marketing, disrupted sleep patterns, and the potential metabolic effects of prolonged screen use. Notably, these pathways are presented as proposed rather than definitively established mechanisms, given the predominance of cross-sectional and longitudinal observational data. Furthermore, this review explores evidence-based intervention strategies aimed at mitigating screen-related health risks, emphasizing the role of parental guidance, school-based policies, and public health initiatives in fostering healthier developmental trajectories for children. By integrating multidisciplinary insights, this review aims to inform future research directions and practical interventions to address this pressing global health challenge.