Peer-Reviewed Evidence
The Research Base
Every claim on this site is backed by published research. Read the studies yourself.
Mental Health
Ages 6-12
2024
Screen Time and White Matter: Link Between Screen Time and Depression in Childhood and Early Adolescence
Cheng, W. et al. — JAMA Pediatrics
Increased screen time in late childhood is linked to heightened depressive symptoms in early adolescence, mediated by disrupted sleep and white matter microstructure changes — providing a neurological mechanism for harm.
Social Media
Ages 10–15
2024
Social Media Use and Depressive Symptoms During Early Adolescence
JAMA Network Open — JAMA Network Open
Longitudinal study finding that more time on social media during early adolescence predicts significantly increased depressive symptoms over time — effects were dose-dependent and persisted after controlling for confounders.
Mental Health
Ages 12–18
2025
Associations Between Screen Time Use and Health Outcomes Among Adolescents
Zablotsky, B. et al. — CDC / Preventing Chronic Disease
CDC-backed national study: teens with high daily screen time were 2.7Ă— more likely to report depression symptoms (25.9% vs 9.5%) and 2.2Ă— more likely to report anxiety symptoms compared to low-screen-time peers.
Sleep
Ages 5–18
2025
Screen Time and Sleep: A Systematic Review of the Association with Adverse Sleep Outcomes
He, X. et al. — PMC / Systematic Review
Comprehensive systematic review confirming robust associations between increased screen time and adverse sleep outcomes across all age groups, with adolescents showing the strongest effects — particularly from evening device use.
Sleep
Ages 11–18
2024
The Impact of Social Media Use on Sleep and Mental Health in Youth
Danny, J.Y. et al. — Current Psychiatry Reports
Review of 94 studies finding that social media use is strongly associated with both sleep disruption and mental health problems in youth, with bidirectional effects — poor sleep worsens social media use and vice versa.
Policy
Ages 0–18
2025
Digital Ecosystems, Children, and Adolescents: AAP Policy Statement
American Academy of Pediatrics — Pediatrics
Updated AAP policy citing accumulated evidence across attention, mental health, sleep, and development. Recommends no screens for children under 2 (except video calls), and consistent limits through age 18.
Development
Ages 0–18
2023
Screen Time and Its Health Consequences in Children and Adolescents
PMC / NIH Systematic Review — International Journal of Environmental Research
Comprehensive review linking excessive screen time to obesity, cardiometabolic risk, poor mental health, and unhealthy eating habits across children and adolescents. Establishes screen time as a multi-domain health risk.
Social Media
Ages 13–18
2025
Effects of Social Media Use on Youth and Adolescent Mental Health
PMC / Meta-Analysis — PLOS Mental Health
Meta-analysis of recent literature confirming the majority of studies link social media use to adverse mental health outcomes — particularly depression and anxiety — with consistent patterns across Western nations.
Mental Health
Ages 6-12
2024
Screen Time and White Matter: Link Between Screen Time and Depression in Childhood and Early Adolescence
Cheng, W. et al. — JAMA Pediatrics
Increased screen time in late childhood is linked to heightened depressive symptoms in early adolescence, mediated by disrupted sleep and white matter microstructure changes — providing a neurological mechanism for harm.
Mental Health
Ages 12–18
2025
Associations Between Screen Time Use and Health Outcomes Among Adolescents
Zablotsky, B. et al. — CDC / Preventing Chronic Disease
CDC-backed national study: teens with high daily screen time were 2.7Ă— more likely to report depression symptoms (25.9% vs 9.5%) and 2.2Ă— more likely to report anxiety symptoms compared to low-screen-time peers.
Social Media
Ages 10–15
2024
Social Media Use and Depressive Symptoms During Early Adolescence
JAMA Network Open — JAMA Network Open
Longitudinal study finding that more time on social media during early adolescence predicts significantly increased depressive symptoms over time — effects were dose-dependent and persisted after controlling for confounders.
Social Media
Ages 13–18
2025
Effects of Social Media Use on Youth and Adolescent Mental Health
PMC / Meta-Analysis — PLOS Mental Health
Meta-analysis of recent literature confirming the majority of studies link social media use to adverse mental health outcomes — particularly depression and anxiety — with consistent patterns across Western nations.
Sleep
Ages 5–18
2025
Screen Time and Sleep: A Systematic Review of the Association with Adverse Sleep Outcomes
He, X. et al. — PMC / Systematic Review
Comprehensive systematic review confirming robust associations between increased screen time and adverse sleep outcomes across all age groups, with adolescents showing the strongest effects — particularly from evening device use.
Sleep
Ages 11–18
2024
The Impact of Social Media Use on Sleep and Mental Health in Youth
Danny, J.Y. et al. — Current Psychiatry Reports
Review of 94 studies finding that social media use is strongly associated with both sleep disruption and mental health problems in youth, with bidirectional effects — poor sleep worsens social media use and vice versa.
Development
Ages 0–18
2023
Screen Time and Its Health Consequences in Children and Adolescents
PMC / NIH Systematic Review — International Journal of Environmental Research
Comprehensive review linking excessive screen time to obesity, cardiometabolic risk, poor mental health, and unhealthy eating habits across children and adolescents. Establishes screen time as a multi-domain health risk.
Policy
Ages 0–18
2025
Digital Ecosystems, Children, and Adolescents: AAP Policy Statement
American Academy of Pediatrics — Pediatrics
Updated AAP policy citing accumulated evidence across attention, mental health, sleep, and development. Recommends no screens for children under 2 (except video calls), and consistent limits through age 18.
Key Voices
Voices Worth Knowing
The researchers, clinicians, educators, and advocates driving the global conversation on childhood and technology.
JH
Jonathan Haidt
Social Psychologist, NYU Stern
Mental Health
Social Media
Policy
Author of The Anxious Generation and The Coddling of the American Mind. His research documents how a phone-based childhood replaced a play-based childhood after 2012 — and traces the mental health collapse that followed. His work has directly influenced phone-free school policies in the US, UK, and Australia.
JT
Jean Twenge
Professor of Psychology, San Diego State University
Research
Teen Wellbeing
Professor of Psychology at San Diego State University and author of iGen. Her generational research found that major depressive episodes doubled among adolescents between 2011 and 2019 — before COVID. Emergency room admissions for self-harm doubled among 15–19 year old girls and quadrupled among 10–14 year old girls over the same period. She links the inflection point directly to 2012 — when smartphones became ubiquitous among teens.
AL
Dr. Anna Lembke
Professor of Psychiatry at Stanford University School of Medicine & Chief of the Stanford Addiction Medicine Dual Diagnosis Clinic
Dopamine
Addiction
Digital Compulsion
Psychiatrist and Chief of Stanford Addiction Medicine. Author of Dopamine Nation. Her research on dopamine and compulsive behaviour explains precisely why social media and games are so hard for children to put down — they are deliberately designed to exploit the same neurological pathways as addictive substances. Social media is not accidentally addictive. It is engineered to be.
CN
Cal Newport
Computer Scientist & Author
Digital Minimalism
Attention
Computer scientist and author of Digital Minimalism and Deep Work. Newport argues for deliberate, minimal tech use and offers concrete frameworks for families and schools to reclaim attention. His case is practical rather than clinical — you don’t need to wait for legislation. You can restructure your household around deep work and real life right now.
DS
Dr. Sherry Turkle
MIT Professor, Founder of MIT Initiative on Technology and Self
Empathy
Social Skills
MIT Professor and founder of the MIT Initiative on Technology and Self. Author of Reclaiming Conversation. Her ethnographic research across homes, schools and workplaces shows how device use is eroding children’s capacity for empathy, solitude and face-to-face conversation — the foundational skills of being human. “If you don’t teach your children how to be alone, they’ll only know how to be lonely.”
EC
Emily Cherkin
Author and Founder of The Screentime Consultant
Practical Frameworks
Family Tech
Schools
Former middle school teacher and founder of The Screentime Consultant. Author of The Screentime Solution. Testified before the US Senate in January 2026 with a stark picture of modern childhood: 40% of 2-year-olds in America now have a personal tablet. Occupational therapists are having to teach young children how to turn the pages of a book. “This is not a kid problem. It is an adult problem that is impacting children.” One of the most credible practical voices for families and schools.
JC
Dr. Jared Cooney Horvath
Educational Neuroscientist, Director of LME Global
Cognitive Development
Learning
Schools
Neuroscientist and educator who has lectured at Harvard and the University of Melbourne and worked with over 750 schools internationally. Author of The Digital Delusion. Testified before the US Senate in January 2026, arguing that screens are rewiring how children process information. The SAT, he notes, has shifted from testing comprehension — long passages, deep questions — to testing skimming: 54 sentences, one question each. “That is not progress. That is surrender.” Humans evolved to learn from other humans, not screens. He makes the cognitive case that mainstream advocacy is missing.
JR
Dr. Jenny Radesky
Developmental Pediatrician, University of Michigan Medical School
Â
Pediatrics
Early Childhood
AAP Policy
Associate Professor of Pediatrics at the University of Michigan and co-Medical Director of the AAP Center of Excellence on Social Media and Youth Mental Health. Lead author of the AAP policy statements on children and digital media. Her lab found that 99% of children’s apps studied had at least one design feature engineered to extend engagement or monetise children’s time — often through characters they trusted. Testified before the US Senate in January 2026. One of the most institutionally credible voices on screens and child development working today.
MW
Molly Wright
Child Advocate & TED Speaker
Early Childhood
Play
Development
Commissioned by the Minderoo Foundation and directed by the filmmaker behind The Greatest Showman, Wright’s TED talk on early childhood development became the most-watched TED talk of 2021 and third most popular in TED history. Delivered at age 7, it makes the case for play, connection, and screen-free early years in language every parent understands instantly. Powerful because a child is making the argument about childhood.
