In individuals with depression and anxiety, the composition or alteration of their gut microbiota can significantly affect their psychological symptoms. Articles for this study were selected using PubMed and NCBI (National Center for Biotechnology Information) with the following search terms: "gut microbiota," "depression," "anxiety," "probiotics," and "prebiotics." These studies evaluated the composition of the gut microbiota and the decrease in symptoms of depression and anxiety due to treatment with probiotics and prebiotics.
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