Smartphone Ownership Linked to Eating Disorder Risk
A new study has found that smartphone ownership eating disorder risk may be associated with each other during early adolescence, raising new questions about when children should receive their own personal devices.
Researchers studying nearly 9,000 adolescents in the United States found that children who owned smartphones at age 12 were more likely to report several eating disorder symptoms at ages 12 and 14 than those who did not own smartphones at that age.
The findings, published September 25 in JAMA Network Open, do not prove that owning a smartphone causes eating disorders. Instead, the research identified a significant association between smartphone ownership at age 12 and later symptoms involving binge eating, weight-control behaviors and self-worth tied to weight.
The research comes as smartphones and social media have become increasingly common among younger children. Experts say the issue may involve more than the amount of time children spend looking at screens. The age at which a child receives a personal smartphone could also matter because of the type of content and social interactions the device makes available.
Smartphone Ownership and Eating Disorder Risk in Early Adolescence
The study analyzed data from the Adolescent Brain Cognitive Development, or ABCD, Study, a large longitudinal research project examining brain development and health among children in the United States.
Researchers included 8,957 adolescents in their analysis. About 70% of participants owned a smartphone at age 12, while the remaining participants did not own one at that age.
The researchers then examined several eating disorder symptoms, including binge eating, inappropriate behaviors intended to prevent weight gain, concern about gaining weight and whether a young person’s self-worth was strongly connected to their weight.
The results showed that smartphone ownership at age 12 was associated with a higher prevalence of several symptoms at the same age.
More importantly, the researchers also found associations two years later.
Among adolescents who owned smartphones at age 12, the risk of reporting any eating disorder symptom at age 14 was 49% higher after statistical adjustments compared with adolescents who did not own smartphones at age 12.
The longitudinal analysis also found a 67% higher risk of binge-eating symptoms, a 50% higher risk of inappropriate compensatory behaviors intended to prevent weight gain and a 103% higher likelihood of reporting self-worth tied to weight.
These figures describe statistical associations from the study. They should not be interpreted as evidence that receiving a smartphone automatically causes a child to develop an eating disorder.
Why Age 12 May Be an Important Period
Early adolescence is a period of significant physical and emotional development.
Children around this age are going through puberty, becoming more independent and becoming increasingly aware of how they compare with their peers. Body image can become particularly important during this period.
A smartphone can dramatically expand the number of people, images and messages that a child encounters every day.
Instead of comparing themselves primarily with classmates or friends, young people can encounter influencers, celebrities and other social media users whose appearance may be carefully selected, edited or filtered.
That can create a different type of comparison.
The researchers noted that smartphones can provide young people with private and individualized access to digital content. Recommendation algorithms can also repeatedly present similar types of material based on what a user watches or interacts with.
For some children, this may mean repeated exposure to appearance-focused content.
Social Media May Be Part of the Picture
The study did not directly measure everything children viewed on their smartphones. That distinction is important.
Researchers examined smartphone ownership rather than treating ownership as a measurement of exactly how much time each child spent online or which platforms they used.
Therefore, the study cannot identify one specific app, social network or type of content as the cause of the observed associations.
However, previous research has connected social media and screen-based exposure with body dissatisfaction and disordered eating behaviors.
The new study discusses several possible mechanisms. These include appearance comparisons, exposure to idealized body images, problematic social media use and access to online communities that promote unhealthy eating or extreme appearance goals.
Some online communities have historically promoted extreme weight loss or eating behaviors, while other trends encourage intense efforts to change physical appearance.
For younger users, the concern is that a personal smartphone can make such content available privately and continuously.
Smartphone Ownership Was Also Linked to Binge Eating
Binge eating was one of the symptoms that showed a significant association with smartphone ownership.
In the longitudinal analysis, adolescents who had owned smartphones at age 12 had a risk ratio of 1.67 for binge-eating symptoms at age 14 compared with those who did not own smartphones at age 12, after adjustment for other factors.
The researchers also identified an association with inappropriate compensatory behaviors designed to prevent weight gain.
These behaviors can include attempts to compensate for food consumption through unhealthy methods.
Importantly, the study measured symptoms rather than making a clinical diagnosis of an eating disorder in every participant.
That distinction matters because eating disorder symptoms exist across a spectrum. A young person can experience concerning eating behaviors without meeting the full diagnostic criteria for a specific eating disorder.
Self-Worth and Weight Were Strongly Connected
One of the notable findings involved self-worth.
Adolescents who owned smartphones at age 12 were more likely to report that their sense of self-worth was connected to their weight.
In the longitudinal analysis, smartphone ownership at age 12 was associated with a risk ratio of 2.03 for this symptom at age 14.
Researchers say this may be particularly relevant because body image and social comparison can become more important during puberty.
When young people repeatedly encounter highly curated images of other people’s bodies, they may compare themselves against standards that are unrealistic or difficult to achieve.
That does not mean every child with a smartphone will experience body dissatisfaction. Instead, the findings suggest that early personal smartphone access may be one factor worth considering alongside other environmental and psychological influences.
The Study Does Not Prove Smartphones Cause Eating Disorders
One of the most important limitations is that the research was observational.
Children were not randomly assigned to receive or not receive smartphones at age 12. Instead, researchers analyzed existing data and examined associations between smartphone ownership and eating disorder symptoms.
As a result, the study cannot establish a direct cause-and-effect relationship.
There may be other differences between children who receive smartphones earlier and those who do not.
For example, family circumstances, social environments, mental health, parental monitoring, school experiences and other factors may influence both smartphone ownership and eating behaviors.
The researchers adjusted for numerous potential confounding factors, but they acknowledged that residual confounding could remain. They also noted that reverse causation cannot be ruled out.
The study also did not measure the specific content each child consumed on their smartphone.
That means the researchers cannot conclude that social media, appearance-related posts or any particular online trend explains the results.
Sleep Could Also Play a Role
Another possible pathway involves sleep.
Smartphones can be used late at night, potentially reducing sleep duration or disrupting normal sleep patterns.
Sleep itself has been associated with appetite regulation, emotional responses and other aspects of health.
The researchers therefore identified nighttime smartphone use and sleep disruption as possible mechanisms that could contribute to the relationship between early smartphone ownership and eating disorder symptoms.
However, this was a proposed mechanism rather than something the study directly demonstrated.
More research will be needed to determine how much of the observed relationship can be explained by sleep, social media exposure, body image concerns or other factors.
What Parents Can Do About Kids and Smartphones
The findings may give parents another reason to think carefully about when a child receives a personal smartphone.
The researchers did not identify a single “perfect” age for smartphone ownership.
Instead, the findings suggest that families may want to consider the child’s developmental stage, the amount of supervision available and the types of digital activities the child will be able to access.
Parents who decide to give a child a smartphone can establish boundaries from the beginning.
Those rules might include limiting which applications can be downloaded, setting age-appropriate privacy controls, creating screen-free periods and keeping smartphones outside bedrooms at night.
Parents can also talk with children about what they see online.
A child who encounters unrealistic beauty standards or weight-loss content may not recognize that photos can be edited, carefully selected or presented without the context of everyday life.
Open conversations can help children understand that online images do not necessarily represent realistic standards.
Keeping Phones Out of the Bedroom May Help
Nighttime phone use is another area parents may want to address.
Keeping a smartphone outside the bedroom can make it easier for children to maintain consistent sleep routines and can reduce the opportunity for unsupervised late-night browsing.
It can also make parental boundaries easier to enforce.
The goal does not necessarily have to be eliminating technology.
Instead, families can create predictable rules around when and where devices are used.
The researchers highlighted the importance of parents remaining involved in their children’s digital lives rather than simply handing over a device and leaving children to navigate the online environment alone.
Watch for Changes in Eating and Body Talk
Parents may also want to pay attention to changes in how children talk about food, weight and appearance.
Warning signs can include persistent concerns about weight, extreme dieting, excessive exercise, changes in eating habits or repeated negative comments about body shape.
A child who suddenly becomes highly focused on calories or expresses strong fear about gaining weight may benefit from a conversation with a parent, pediatrician or qualified mental health professional.
Early support can be important because eating disorders can become serious conditions.
The new research reinforces the importance of paying attention not only to the device itself but also to what children experience while using it.
A Broader Question About Children’s Digital Lives
The smartphone findings add to a growing research discussion about children’s digital environments.
Smartphones combine several functions in one device. They provide communication, entertainment, social networking, video, search, games and access to algorithmically recommended content.
That makes it difficult to isolate one specific influence.
The researchers said future studies should examine whether changes in smartphone ownership are followed by changes in eating disorder symptoms and should investigate the roles of social media exposure, sleep disruption and body image-related processes more closely.
More research may eventually help clarify whether delaying personal smartphone ownership changes the risk of eating disorder symptoms or whether smartphone ownership is primarily a marker for other social and environmental factors.
What the New Research Means for Families
The new study provides another reason to treat smartphone ownership as more than a simple technology decision.
For parents, the question is not only whether a child needs a phone. It can also involve when the child receives one, which applications are available, how much supervision is provided and how the child responds to online content.
At the same time, the evidence should be interpreted carefully.
The researchers found an association between smartphone ownership at age 12 and eating disorder symptoms, but they did not establish that smartphones directly cause eating disorders.
The study’s large sample and longitudinal design provide important evidence for further research, while its observational nature leaves unanswered questions about causality.
As smartphones continue to reach children at younger ages, understanding these relationships could become increasingly important.
For now, families can focus on age-appropriate digital boundaries, open conversations about body image and online content, healthy sleep routines and early attention to changes in eating behavior.
The broader message is not simply about taking phones away. It is about helping children navigate an increasingly digital environment during one of the most sensitive stages of development.
Sources: JAMA Network Open original research by Jason M. Nagata and colleagues; CNN Health reporting on the study.
Suggested external link: Read the original JAMA Network Open study
Suggested internal links: Link to related articles on children’s screen time, social media and mental health, teen wellness, sleep and adolescent health.
