Depression may be easier to treat in young teenagers than in adults, according to a new study, because their symptoms are still flexible and not yet fixed. Researchers from the University of Edinburgh found that depressive symptoms—such as sadness, fatigue, and lack of interest—are less predictable in early adolescence, but gradually become more stable and ingrained with age. This shift could explain why depression often becomes harder to treat in adulthood.
The study, which analysed data from over 35,000 young people, used a physics-inspired method to understand how symptoms interact. Just as heat causes particles in matter to move and change state, the team measured a kind of 'network temperature' to assess how fluid or rigid depression symptoms were. They found that symptoms fluctuate more in early adolescence but tend to settle into patterns over time.
“Depression is a complex condition, and current treatments don’t usually take into account how symptoms interact or change,”
say the researchers. Their findings suggest that early intervention—when symptoms are still shifting—may be key to preventing long-term, treatment-resistant depression.
The team also found that boys’ symptoms tended to stabilise sooner than girls’, which could mean less time for other factors—like support, stress, or hormones—to make a difference. Girls’ symptoms remained more changeable for longer, potentially offering a bigger window for intervention.
While the research offers new insight into why some depression becomes persistent, the authors stress that more studies are needed to explore the theory further.
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