The Microbiota-Gut-Brain Axis (MGBA) is a crucial biological system that links the gut microbiota, the gastrointestinal (GI) tract, & the brain. It serves as a two-way communication network, influencing a variety of physiological functions, including digestion, mood, immune responses, & metabolic regulation. The vagus nerve plays a central role in this system by facilitating communication between the gut and the brain.