You may have heard the phrase "the gut is your second brain." While it sounds surprising, modern research has shown that your digestive system and your brain are constantly communicating through a network known as the Gut-Brain Axis. Your gut does much more than digest food. It continuously sends signals to your brain—and receives signals in return. This two-way communication may influence appetite, feelings of fullness, mood, digestion, sleep, and may also play a role in wei