Activity may reduce symptom severity in people with high genetic depression risk

Major depressive disorder is common worldwide and involves persistent low mood and loss of interest. Researchers at the University of Texas at San Antonio recently analyzed data regarding these factors. Their findings were published in the journal Nature Mental Health. This work focuses on how lifestyle behaviors might interact with inherited risk.

The team examined records from the National Institutes of Health All of Us Research Program. This initiative collects health information from people across the United States. The study specifically looked at thousands of adults participating in the program. It included genetic information and electronic health records for analysis.

Participants wore Fitbit devices that tracked movement over a long period. On average, each person contributed approximately 1.6 years of wearable data. This provided a reliable picture of habitual activity compared to short measurements. The researchers also calculated a depression polygenic risk score for every participant.

This genetic score summarizes the combined influence of many variants linked to the disorder. People with higher scores were more likely to receive a depression diagnosis in their records. In contrast, greater physical activity was linked to a lower likelihood of a diagnosis overall.

The relationship between genetics and symptoms showed a specific pattern regarding severity. Individuals with higher genetic vulnerability appeared to benefit more from being physically active. Those who were more active tended to have less severe depression symptoms than those who were less active.

This finding held true across different measures of movement including daily steps and moderate-to-vigorous activity. It suggests that people's genetic vulnerability does not necessarily determine the severity of their experience. Some adjustable lifestyle behaviors could play a role in shaping how risks are expressed.

The study was observational so it cannot conclude that activity directly offsets genetic risk. Researchers caution that these findings provide a direction for future work on prevention and treatment. Personalized exercise recommendations might eventually be tailored to an individual's genetic profile.

Future plans include investigating other mental health conditions like anxiety disorders. Sleep is another lifestyle factor they intend to examine alongside physical activity for its link to genetics. The broader goal is to understand how genetic susceptibility interacts with everyday behaviors.