Diet and depression: a review of dietary patterns, probiotics and prebiotics
A narrative review brings together dietary trials, observational food studies and research on probiotics and prebiotics, with different limits on what each can establish.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The review reports reduced depressive symptoms with Mediterranean-style dietary interventions and small to moderate symptom benefits with selected probiotics and prebiotics. Ultra-processed food exposure was associated with higher risk of depressive outcomes and common mental disorders in observational cohorts. Those associations do not establish causation, and the abstract does not quantify benefits for a particular person.
Large, long-term, multicenter dietary trials remain a gap. Probiotic and prebiotic studies differed in strains, doses and duration, and the abstract gives no pooled estimates or detailed comparison conditions.
What the interventions showed
The dietary intervention evidence concerned adults with major depression or symptoms below the diagnostic threshold. The review described probiotic and prebiotic benefits as small to moderate across clinical and nonclinical samples, with considerable variation between approaches.
Mechanisms remain proposed
The authors discuss substances produced by gut microbes and immune signals as possible links between diet and mental health. These proposed pathways frame research questions, but the abstract does not establish that a particular mechanism produced the reported symptom changes.
The original publication
The Immune Mind: Linking Dietary Patterns, Microbiota, and Psychological Health.
Marano G, Traversi G, Mazza O et al.
Nutrients · 2025
- PubMed ID
- 41515213
- Record checked
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