The Role of Microbiome in Human Health and Disease: Current Insights and Future Directions

The human microbiome, encompassing trillions of microorganisms residing in the gut, skin, oral cavity, and other body sites, plays a critical role in maintaining physiological homeostasis and influencing disease susceptibility. This review synthesizes current knowledge on the composition, function, and dynamics of the microbiome and its interactions with the host immune system, metabolism, and neurological pathways. Evidence from preclinical studies, clinical research, and large-scale metagenomic analyses highlights the microbiome’s involvement in metabolic disorders, autoimmune diseases, cancer, infectious diseases, and mental health conditions.