Probiotics and Prebiotics Linked to Reduced Depression and Anxiety Symptoms, Meta-Analysis Finds

A new meta-analysis published in the Journal of Psychiatric Research suggests that probiotics, prebiotics, and their combination (synbiotics) may help reduce symptoms of depression and anxiety in adults with mild-to-moderate depression or major depressive disorder.

The study, led by Dr. Reza Moshfeghinia from Shiraz University of Medical Sciences, analyzed data from 19 clinical trials involving over 1,400 adults. Of these, 523 participants served as the control group. The research found that individuals who received probiotics, prebiotics, or synbiotics experienced a significantly greater decrease in depression and anxiety symptoms compared to those who did not receive these interventions. The standardized mean difference (SMD) for depression was -1.8 (95% CI, -2.4 to -1.1), and for anxiety, it was -1.6 (95% CI, -2.8 to -0.4).

Subgroup analyses indicated that the benefits varied based on factors such as nationality, intervention duration, disease severity, body mass index (BMI), age, assessment tools, and the number of probiotic strains used. However, the researchers noted that some studies had concerns regarding risk of bias, and there was significant heterogeneity in how depression was diagnosed and measured across the included trials.

The investigators emphasized that while these findings are promising, future research should focus on comparing these interventions to standard depression and anxiety treatments, identifying the most effective strains, and incorporating more objective measures to better understand their impact.

Disclaimer
The information in this article is based on a recent meta-analysis and should not be considered medical advice. Individual responses to probiotics, prebiotics, or synbiotics may vary, and these supplements are not intended to replace professional medical treatment for depression or anxiety. Always consult a healthcare provider before making changes to your treatment plan. This article does not endorse any specific product or treatment. Some studies included in the meta-analysis had concerns about risk for bias and variability in diagnostic criteria, which may affect the reliability of the results.