You have probably seen the little screen time reminders that pop up after you have been scrolling for a while. Most of us dismiss them without a second thought. A new experiment asked whether a different kind of on-screen warning might actually land with young users.
Warning messages that spelled out mental health harms struck the strongest chord with teenagers and young adults, according to a randomized trial published in JAMA Health Forum on September 4, 2026.
Messages about overall mental health harms, depression and anxiety earned the highest ratings from participants. All of the health warnings also outscored the kind of screen time break that platforms like TikTok already use.
The study was inspired by a 2024 call from then-US Surgeon General Vivek Murthy for tobacco-style warning labels on social media. A federal warning would require an act of Congress and has not been passed.
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Four states have moved on their own, and California's law takes effect January 1, 2027.
What the trial actually measured
Researchers led by Stanford Medicine, with colleagues from the University of North Carolina and the University of California, Davis, built a mock Instagram page. They displayed 15 different messages in random order.
The 1,012 US participants were split roughly evenly between teens aged 13 to 17 and young adults aged 18 to 29.
For each message, participants answered a one-to-five scale question. How much does this message discourage you from wanting to use social media? The warning about overall mental health harms topped the list with a mean score of 3.04 out of 5.
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The screen time break similar to the TikTok approach came in last at 2.74.
One of the stronger versions read, "SURGEON GENERAL'S WARNING: Social media is associated with significant mental health harms for children and young adults."
Others pointed to depression, anxiety, sleep disruption, body image or the fact that social media has not been proven safe for young users.
"Teens and young adults consistently reported that they felt the warning messages we tested would reduce their social media use compared with a control message," said senior author Thomas Robinson.
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An important limit to the finding
The trial measured what young people said a warning would do, not what they actually did. Participants saw each message once on a mock screen and reported how much it would discourage them.
Whether the same wording would change real-world scrolling habits over weeks or months is still an open question. The authors flag this as a key limitation.
Stronger evidence exists for an underlying claim behind the warning push. Heavy social media use is linked to double the risk of depression in some studies of adolescents, which is part of why advocates have pushed for labeling in the first place.
What parents can do while policy catches up
Even without a federal warning label, the major platforms already offer parental tools. Instagram, TikTok, Snapchat and YouTube let users or their parents set daily time limits, quiet hours overnight and content restrictions from a child's account.
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California's law will require social media platforms to display a mental health warning to users under 18 starting January 1, 2027. Colorado, Minnesota and New York have passed similar measures.
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This article is made and published by Aksel Kryhlmand, who may have used AI in the preparation.