Prevalence and risk factors for unhealthy dietary habits among children during COVID-19 pandemic

Abstract

Background The COVID-19 pandemic has led to changes in dietary and lifestyle habits among children and adolescents. This study investigated the prevalence and factors associated with unhealthy dietary habits among 1,475 primary and secondary school students from 2021 to 2022.

Methods A cross-sectional study was conducted in randomly selected primary and secondary schools participating in a project promoting online health education and promotion named GoSmart using self-administered questionnaires. Logistic regression analyses were conducted to investigate the demographic and lifestyle habits associated with various unhealthy dietary habits. This study was approved by Survey and Behavioural Research Ethics (SBRE) [Reference No.: SBRE-21-0052] and funded by Quality Education Fund (QEF#2019/0883).

Results The prevalence of inadequate consumption of vegetables and fruits was high among both primary (81.5%) and secondary school students (89.5%) and associated with physical inactivity in both primary (aOR=3.35, 95%CI: 1.41-7.97, p=0.006) and secondary students (aOR=4.30, 95%CI: 1.51-12.25, p=0.006). A substantial prevalence of breakfast skipping was observed among primary students (22.9%) who spent two or more hours on video games or social media (aORs=1.84-2.27); and among secondary students (23.7%) who consumed two or more hours on social media, alcohol consumption, and consumption of unhealthy food (aORs=1.42-2.79). Consumption of unhealthy food was reported by 43.9% and 48.2% for primary and secondary students respectively, with primary and secondary students who spent two or more hours on video games or social media (aORs=1.62-2.27) and secondary students who perceived themselves as underweight (aOR=1.79, 95%CI: 1.13-2.83, p=0.012) having a higher frequency of consumption.

Conclusions There was a high prevalence of unhealthy dietary habits among schoolchildren in Hong Kong. Alarming results were observed with physical inactivity being associated with a higher risk of unhealthy dietary habits among primary and secondary students, which may increase the risk of obesity. Moreover, the apparent interrelationship between unhealthy habits highlights the need for a comprehensive approach to promoting healthy habits through education in this population.