The gut microbiota may be altered in people with depression as a result of treatment. These microorganisms reorganize differently in individuals who respond to therapy. In a multiomics study of antidepressant-naive patients presented at the 2026 World Congress of Neuropsychopharmacology (CINP), scientists from National Taiwan University found that patients who improved after antidepressant treatment maintained a more balanced and functional microbial ecosystem, recovered beneficial metabolites, and displayed blood-based biological signals that aligned with these changes.