What is it about?
Inflammation underlies some cases of depression. Even though omega-3 reduces inflammation, it does not always have an anti-depressant effect. In prior work, we showed that people who experience frequent social stress have greater depressive symptom increases over time, especially if they have exaggerated inflammatory responses to social stressors. We have also shown that omega-3 supplementation reduces inflammatory reactivity to social stress. In this work, we found that omega-3 had an anti-depressant effect particularly among those who experience frequent social stress.
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Why is it important?
There is a recent push to personalize medicine by identifying for whom and under what circumstances certain dietary interventions and medications are effective. In this theory-driven work (based on the Social Signal Transduction Theory of Depression), we showed that omega-3's antidepressant effect was particularly evident among the socially-stressed, perhaps because it reduces inflammatory responses to social stress. Importantly, this anti-depressant evident was only evident among those with frequent social stress, but not other types of stress. Even though some social stress is unavoidable, this work suggests that omega-3 can help to blunt its psychological impact.
Perspectives
These findings demonstrate the primacy of social stress, especially conflict, to depression risk, as well as the role of widely-available, over-the-counter anti-inflammatory interventions in depression prevention. Importantly, these results emerged among a non-clinical sample, and therefore we examined continuously distributed depressive symptoms measured repeatedly over time, which is a critical design for etiology research. Other anti-inflammatory interventions may also effectively prevent inflammation-associated depressive symptoms, especially among the socially-stressed who may be at a higher risk for this etiological pathway. Therefore, it is important to examine social stress frequency as a potential moderator of a treatment or preventative intervention's effect.
Annelise Madison
Ohio State University
Read the Original
This page is a summary of: Omega-3 fatty acids reduce depressive symptoms only among the
socially stressed: A corollary of the social signal transduction theory of
depression., Health Psychology, June 2023, American Psychological Association (APA),
DOI: 10.1037/hea0001301.
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