Gut Microbe Differences Linked to Schizophrenia

A systematic review and meta-analysis looked at gut microbiota in people with schizophrenia compared to healthy controls. The review included 48 studies, with 14 providing data for the meta-analysis. Researchers examined alpha diversity, beta diversity, and the types of bacteria present. They found no statistically significant differences in alpha diversity measures like Shannon or Simpson indices between patients and controls. However, they did find significant differences in beta diversity, meaning the overall community structure of gut microbes was different. The review also noted a depletion of bacteria that produce short-chain fatty acids and an enrichment of pro-inflammatory bacteria in people with schizophrenia. The study did not report safety data, as it was not an intervention. A main reason to be careful is the substantial heterogeneity among studies and limited control for factors like antipsychotic medication, diet, and lifestyle. The findings suggest candidate bacteria that may be worth further study for biomarkers or microbiome-based therapies, but they do not prove cause and effect.