Medical Xpress says the pattern appeared in months to years of tracker data, though cause and effect remain unproven.
Physical activity could weaken the link between genetic risk and depression severity, Medical Xpress says. The pattern appeared in months to years of tracker data, but cause and effect remain unproven.
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A new observational study suggests physical activity may change how strongly genetic vulnerability shows up in the severity of major depressive disorder, even though it did not alter the link between genetic risk and whether someone had received a diagnosis.
The Nature Mental Health study, published Oct. 2, analyzed 23,517 adults in the National Institutes of Health's All of Us Research Program. Researchers combined whole-genome sequencing, electronic health records, self-reported lifetime diagnoses and long-term Fitbit data. They found that more active participants tended to have less severe depressive symptoms, with a stronger association among people carrying higher genetic risk.
The team calculated a polygenic risk score for each participant. That score combines the small effects of many genetic variants associated with depression; it estimates inherited susceptibility but does not diagnose the disorder.
Participants ranged from 18 to 92 years old, with an average age of about 56, and 67.2% were women. Their Fitbits supplied an average of 582 days of data, roughly 1.6 years. The researchers looked at daily step counts and minutes of moderate-to-vigorous activity rather than relying only on a short survey about exercise.
The results split into two distinct patterns. Higher genetic risk scores were associated with a greater likelihood of a depression diagnosis, while greater physical activity was associated with a lower likelihood. But the researchers found no statistically significant interaction between genetic risk and activity for diagnosis itself.
Symptom severity was different. Across multiple definitions of severity and both activity measures, higher physical activity weakened the statistical association between genetic risk and symptom burden. In practical terms, more active participants with higher genetic vulnerability tended to have less severe recorded symptoms than less active participants with similar genetic risk.
The analysis did not assign people to exercise programs, so it cannot show that becoming more active directly reduced symptoms or offset genetic risk. Depression can also make physical activity harder, and other differences between more active and less active participants may have affected the results.
Lead author Qiliang He told Medical Xpress that future studies should test whether increasing activity reduces symptom severity among people with high genetic risk. The current findings point to a possible role for activity in personalized mental-health care, but they do not establish an exercise dose or replace existing treatment.
@medical_xpressPhysical activity could weaken the link between genetic risk and depression severity—a pattern seen in months to years of tracker data, with cause and effect still unproven. @NatMentHealth https://medicalxpress.com/news/2026-10-physical-weakens-link-genetic-depression.html?utm_source=twitter.com&utm_medium=social&utm_campaign=v2@medical_xpressPhysical activity could weaken the link between genetic risk and depression severity—a pattern seen in months to years of tracker data, with cause and effect still unproven. @NatMentHealth https://medicalxpress.com/news/2026-10-physical-weakens-link-genetic-depression.html?utm_source=twitter.com&utm_medium=social&utm_campaign=v2@medical_xpressPhysical activity could weaken the link between genetic risk and depression severity—a pattern seen in months to years of tracker data, with cause and effect still unproven. @NatMentHealth https://medicalxpress.com/news/2026-10-physical-weakens-link-genetic-depression.html?utm_source=twitter.com&utm_medium=social&utm_campaign=v2@medical_xpressPhysical activity could weaken the link between genetic risk and depression severity—a pattern seen in months to years of tracker data, with cause and effect still unproven. @NatMentHealth https://medicalxpress.com/news/2026-10-physical-weakens-link-genetic-depression.html?utm_source=twitter.com&utm_medium=social&utm_campaign=v2—
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