Smartphone Ownership at Age 12 Linked to 49% Higher Eating Disorder Risk by Age 14
Children who own a smartphone by the time they reach age 12 face a significantly higher risk of developing eating disorder symptoms within two years, according to new research published in the journal JAMA Network Open. Adolescents with early smartphone access showed a 49 percent higher relative risk of reporting at least one eating disorder symptom by age 14 compared to peers who did not own the devices.
The findings highlight concerns regarding digital exposure during early adolescence. Researchers tracking 8,957 participants in the Adolescent Brain Cognitive Development Study found that almost 70 percent of children already owned a smartphone at age 12, exposing them to appearance-focused content on social media platforms at a highly formative developmental stage.
How the Adolescent Brain Cognitive Development Study Tracked Smartphone Ownership
The investigation utilized data from the Adolescent Brain Cognitive Development Study, a large, ongoing project tracking child health and development across the United States. Researchers analyzed responses from 8,957 participants to determine how early digital independence affects youth. Almost 70 percent of the surveyed adolescents reported owning a smartphone at age 12.
When researchers evaluated the cohort at age 14, clear behavioral divides emerged between phone owners and non-owners. Around 24 percent of the 12-year-old smartphone owners reported experiencing at least one eating disorder symptom by age 14. In contrast, only 16 percent of children who did not receive a phone during their tween years reported similar symptoms.
Specific Eating Disorder Symptoms Tied to Early Phone Access
The data revealed sharp increases in specific disordered behaviors among early smartphone owners. Roughly nine percent of the youth who owned phones experienced binge-eating symptoms by age 14, a figure linked to a 67 percent higher relative risk when possessing a device at age 12.
Beyond binge eating, researchers documented increases in inappropriate compensatory behaviors intended to prevent weight gain, along with adolescents tying their personal self-worth directly to their body weight. Children who owned smartphones at age 12 were twice as likely to tie their self-worth to weight and 50 percent more likely to attempt to offset weight gain through exercising or disordered behaviors like self-induced vomiting.
Social Media Exposure and Body Dissatisfaction in Teens
Lead author Jason Nagata, an adolescent medicine specialist at the University of California San Francisco, explained to CNN that smartphones place appearance-focused content directly into young pockets. Nagata noted that comparing oneself to influencers whose images are curated, edited, and filtered can lead to body dissatisfaction and poor self-esteem, creating risk factors for eating disorders.
While the study establishes a statistical correlation, researchers emphasize that the findings do not prove that smartphones themselves are causing eating disorders. Healthcare Brew noted the market comeback of “dumb phones,” prompting some families to reconsider early smartphone adoption.
Parents Should Delay Smartphone Access to Protect Children
Experts suggest that parents focus on the timing of digital access rather than merely restricting total screen time. Potential actions for families include delaying initial smartphone ownership, establishing clear boundaries regarding screen time, and actively discussing unrealistic images of the body online. University of North Carolina psychology and neuroscience professor Mitch Prinstein informed CNN that recent findings imply holding off for even six months to a year can prove impactful. Future research must determine whether delaying access reduces eating disorder symptoms and which aspects of smartphone use may be implicated.
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