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A new study analyzed whole-genome sequencing and long-term Fitbit data from 23,517 adults.

Polygenic risk scores (PRS) for depression and physical activity interacted regarding symptom severity.

Higher daily physical activity attenuated the link between genetic vulnerability and severe depression.

For decades, exercise scientists and psychiatrists have attempted to map how everyday movement intersects with our genetic blueprints. A family history of depression can increase vulnerability, but genetic liability doesn't tell the whole story.

A new study (He et al., 2026) published in Nature Mental Health examined data from 23,517 participants in the National Institutes of Health's All of Us research program. Their findings suggest that everyday movement may be associated with how strongly someone's genetic risk relates to depressive symptom severity.

The All of Us datasets allowed the researchers to combine whole-genome sequencing, electronic health records (EHRs), and Fitbit activity data to investigate the relationship between genetic vulnerability to depression, weekly physical activity levels, and major depressive disorder (MDD) diagnosis and symptom severity.

Study participants' Fitbit records covered an average of 582 days, giving researchers a longer-term picture of habitual movement than a brief exercise questionnaire would provide. By measuring daily steps and moderate-to-vigorous physical activity........

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