Excessive screen time linked to binge-eating by US researchers

Children in the US who have more screen time at ages 9-10 are more likely to develop binge-eating disorder one year later, according to a new national study.

The study, published in the International Journal of Eating Disorders, found that each additional hour spent on social media was associated with a 62 percent higher risk of binge-eating disorder one year later. It also found that each additional hour spent watching or streaming television or movies led to a 39 percent higher risk of binge-eating disorder one year later.

Binge-eating disorder is characterised by eating large quantities of food in a short period of time, a feeling of loss of control during the binge, and experiencing shame or guilt afterwards. Binge-eating disorder can be severe and life-threatening if it causes heart disease or diabetes, and it is the most common eating disorder in the US.

“Children may be more prone to overeating while distracted in front of screens. They may also be exposed to more food advertisements on television. Binge-watching television may lead to binge-eating behaviours because of overconsumption and a loss of control,” said lead author, Jason Nagata, MD, assistant professor of paediatrics at the University of California, San Francisco.

The researchers analysed data from 11,025 nine to 11 year old children who are part of the Adolescent Brain Cognitive Development Study, the largest long-term study of brain development in the US.

The children answered questions about their time spent on six different screen time modalities, including television, social media, and texting. Parents answered questions about their children’s binge-eating behaviours, specifically the frequency and characteristics of overeating and related distress.

“Exposure to social media and unattainable body ideals may lead to a negative body image and subsequent binge eating,” said senior author, Kyle T. Ganson, PhD, assistant professor at the University of Toronto’s Factor-Inwentash Faculty of Social Work.

“This study emphasises the need for more research on how screen time impacts the well-being of young people now and in the future.”

While the study was conducted prior to the COVID-19 pandemic, its findings are especially relevant during the Coronavirus crisis say the research team. “With remote learning, the cancellation of youth sports, and social isolation, children are currently exposed to unprecedented levels of screen time,” said Nagata.

“Although screen time can have important benefits such as education and socialisation during the pandemic, parents should try to mitigate risks from excessive screen time such as binge eating. Parents should regularly talk to their children about screen-time usage and develop a family media use plan.”