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Evidence-Based Reviews & Longevity Research

Can Your Smartwatch Improve Mental Health? The Wearables With Clinical Evidence

Health Science Hub Editorial

Evidence review & editorial synthesis

Wearables were once glorified step counters. Increasingly, they are becoming something more interesting: tools that may actually help change how people feel.

A new systematic review and meta-analysis of 32 randomized trials involving 3,061 adults found that wearable-based interventions improved depressive symptoms, anxiety and quality of life. The pooled effects were moderate, with standardized mean differences of -0.43 for depression, -0.49 for anxiety and +0.41 for quality of life.

That makes the emerging story around smartwatches and fitness trackers considerably more compelling. These devices are not simply observing health from the wrist. In randomized studies, wearables have become part of interventions producing measurable improvements in mental well-being, resilience, behavior and quality of life.

And in some cases, the devices are familiar consumer wearables that people can already buy.

From Health Tracking to Mental Health Intervention

The new Journal of Affective Disorders analysis specifically examined randomized controlled trials in which wearable device-based interventions targeted psychological outcomes in adults. Across 32 trials, encompassing 3,061 participants with a mean age of 51.6 years, wearable interventions were associated with significant improvements in depression, anxiety and quality of life.

The important shift is what happens after the device collects the data.

A wearable can make movement visible, reveal sleep patterns, provide physiological feedback, encourage activity, reinforce daily targets and connect measurements to a structured behavioral program. In other words, the useful part may not simply be the sensor. It is the feedback loop between measurement and action.

Several individual studies show what that can look like in practice.

Garmin Venu: A Consumer Smartwatch With Randomized Evidence

One of the most commercially relevant examples comes from a 2025 randomized clinical trial in JAMA Network Open.

Researchers enrolled 184 physicians at two US medical centers and randomly assigned them to receive a smartwatch immediately or after a six-month delay. Participants in the immediate intervention group received a Garmin Venu 2 Plus connected to Garmin Connect. When that model was no longer available, participants in the delayed group received a Garmin Venu 3S. Both watches tracked heart rate, activity, respiratory rate, stress levels and sleep patterns.

After six months, physicians in the smartwatch group had significantly greater resilience. In adjusted analysis, their odds of overall burnout were 54% lower than those of the control group.

That is notable because the intervention used a mainstream consumer smartwatch rather than an experimental medical device.

The trial did not find significant six-month differences between groups for depressive symptoms, perceived stress or overall quality of life, so its strongest evidence is specifically for burnout and resilience. Those are meaningful outcomes in their own right, and the result provides unusually direct evidence that access to everyday wearable data can become part of a psychologically useful intervention.

BioBeam Shows What Happens When Data Becomes Support

Another randomized trial illustrates what becomes possible when wearable sensing is deliberately connected to mental health support.

Researchers tested the BioBase digital therapeutic and paired BioBeam wrist wearable in university students with elevated anxiety or stress. The wearable collected passive physiological and behavioral information, while the app incorporated mood tracking, personalized feedback and psychological tools including breathing, relaxation and mindfulness exercises.

After four weeks, participants using BioBase experienced significantly lower anxiety and improved mental well-being compared with a waitlist control group. Depressive symptoms also fell significantly over the intervention period.

BioBeam itself is not the mainstream consumer watch most readers will be shopping for today. What makes the study important is the model it demonstrates: the wearable becomes a sensor for everyday life, software turns those measurements into understandable feedback, and the intervention gives the user something useful to do with it.

That combination may represent one of the most promising directions for future consumer wearables.

Smartwatches Can Influence More Than Step Counts

Evidence also suggests that wearable benefits can extend beyond people seeking formal mental health treatment.

In a three-month randomized controlled trial, healthy young adults were assigned to use a commercial smartwatch, a simpler smart bracelet or a smartphone app. The smartwatch intervention improved health-promoting behavior and showed advantages in physical, mental and overall quality-of-life measures compared with the app-only control condition.

Wearables have also produced encouraging results in populations facing substantial psychological stress. A randomized pilot trial involving 143 adolescents and young adults with cancer compared usual care, an eight-week physical activity program based on intelligent wearable devices, and an internet-delivered modified behavioral activation program.

The wearable-supported physical activity intervention reduced anxiety and depression, lowered salivary cortisol and increased physical activity. In this population, the investigators reported better anxiety and depression outcomes with the wearable-supported program than with the internet-based behavioral activation intervention.

Supportive evidence also comes from a smaller study in young people with cancer who received Fitbit devices and iPads. Participants subsequently showed improvements across all eight measured dimensions of health-related quality of life. Because that study was not randomized, it is best viewed as supportive rather than as proof that Fitbit itself caused the improvement.

What Seems to Make a Mental Health Wearable Work?

Taken together, the studies suggest a more useful question than simply asking which smartwatch contains the largest number of sensors.

The most promising interventions turn measurement into behavior.

Activity tracking can expose sedentary periods and reinforce movement goals. Sleep data can make previously invisible patterns obvious. Heart-rate and stress measurements can provide physiological feedback. Reminders and progress displays can turn an abstract intention into a measurable daily target. More sophisticated systems can combine those signals with breathing exercises, behavioral activation, psychological education or personalized recommendations.

This matters because a wearable occupies a unique position in health care: it accompanies a person through ordinary life. A doctor or therapist sees snapshots. A wearable can collect information every day.

That does not turn a smartwatch into a replacement for psychotherapy, medication or professional mental health care. It gives wearables a potentially valuable complementary role, particularly when the information they collect is translated into actions the wearer can actually take.

The Next Generation Could Be Far More Useful

Today, Garmin, Fitbit and other consumer wearables already measure combinations of movement, sleep and cardiovascular signals. The clinical evidence suggests that the larger opportunity lies in making better use of those measurements.

The Garmin trial shows that even a conventional consumer smartwatch can be associated with measurable improvements in burnout and resilience when people have access to their own physiological data. BioBase demonstrates the next step by connecting wearable measurements directly to structured psychological tools. Wearable-supported activity interventions show another pathway, using continuous measurement and feedback to turn movement goals into improvements that can extend to depression and anxiety.

The logical next generation goes further still.

Instead of simply telling you that you slept poorly, moved less and spent more time physiologically stressed this week, a wearable could recognize the pattern and help interrupt it. It might suggest movement, recovery, breathing or another appropriate behavioral intervention at the moment it is most useful, then track whether that intervention actually changes the pattern over subsequent days.

The watch would no longer just document how you are doing. It could become part of what helps you do better.

The emerging evidence is not pointing toward a magic bracelet that treats depression simply by sitting on your wrist. It points toward something more credible and potentially more useful: wearable technology as a continuous bridge between health data and healthier behavior.

For depression, anxiety, burnout, resilience and quality of life, that bridge is beginning to produce measurable results.

Scientific References & Further Reading

Disclaimer: This article is for informational purposes only and does not constitute medical advice. It is not a substitute for diagnosis, treatment, or individualized medical care.

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