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Abstract

Background: The mechanisms explaining the positive relationship between television (TV) viewing and body massindex (BMI) are unclear. ‘Mindless eating’ and ‘physical activity displacement’ theories have been suggested,but have not been tested longitudinally among young adults. This study aimed to determine whether longitudinalassociations between young adults’ TV viewing and BMI are explained by changes in TV-related food and beverageconsumption (FBC) and/or leisure-time physical activity (LTPA) over 5 years among young adults.Methods: A cohort of young Australian adults (n = 1068) was assessed in 2004–6 (T1) and 2009–2011 (T2), height andweight were measured (T1) or self-reported (T2), and participants self-reported TV viewing time (hours/day), weekly TVrelatedFBC and LTPA (mins/week). Linear regression was used to examine direct pathways between TV viewing andBMI, adjusting for TV-related FBC and LTPA to examine indirect pathways.Results: The association between TV viewing time and BMI (β: 0.41, 95% CI 0.03, 0.78 for > 1-h increase in TV viewing/day) was not explained by TV-related FBC (β: 0.37, 95% CI -0.18, 0.91) or LTPA (β: 0.38, 95% CI -0.17, 0.93) hypotheses.Increased TV-related FBC was associated with increased TV viewing (0.39 ± 1.54 h/day) and greater increases in BMI (0.92 ± 2.28 kg/m2, p= 0.16). LTPA increases were not associated with changes in TV viewing (− 0.07 ± 1.42 h/day), andincreases in BMI were smallest when LTPA increased (0.44 ± 2.25 kg/m2) and greatest when LTPA decreased (0.82 ± 2.30 kg/m2) (p = 0.13).Conclusions: Factors other than changes in TV-related FBC or LTPA may explain the longitudinal relationship betweenTV viewing and increasing BMI among young adults. Findings confirm that TV viewing is a risk factor for weight gain inyoung adults but the underlying causal mechanisms remain unclear.

Item Type:	Article
Authors/Creators:	Cleland, V and Patterson, K and Breslin, M and Schmidt, MD and Dwyer, T and Venn, AJ
Keywords:	diet, food and nutrition, body weights and measures, behaviour, health, health promotion
Journal or Publication Title:	Bmc Public Health
Publisher:	Biomed Central Ltd
ISSN:	1471-2458
DOI / ID Number:	https://doi.org/10.1186/s12889-018-5674-4
Copyright Information:	© 2018 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/
Related URLs:	Google Scholar: Cleland, V Google Scholar: Venn, AJ UTAS Profile: Venn, AJ
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