The gastrointestinal system is far more than a simple digestive tube—it's a highly coordinated network of muscles, nerves, hormones, and specialized cells working together to extract energy, regulate appetite, and maintain whole-body health. In this episode, we take a deep dive into the remarkable physiology of the gut, exploring how food moves through the digestive tract, how the enteric nervous system operates as the body's "second brain," and how key hormones orchestrate digestion, absorption, and metabolism. Along the way, we connect foundational concepts to real-world clinical conditions and modern therapies, revealing the elegant biological engineering behind one of the body's most complex systems.