The gut contains trillions of bacteria, fungi, and viruses. Together, they're known as the gut microbiota. They help keep you healthy in several ways.
The gut supplies nutrients from food to the cells in your body. It also uses and produces vitamin K, which helps with blood clotting and bone health.
The gut also helps your body fight infection and manage energy use. A healthy gut can reduce anxiety and improve mood. When you have a healthy gut, you have regular bowel movements and minimal gas and bloating. You will also have steady energy throughout the day.
But when you have an unhealthy gut, you may have symptoms like bloating, diarrhea, belly pain, or constipation. A poor gut can also lead to problems like brain fog, joint pain, and headaches. And it may cause other bowel problems like irritable bowel syndrome (IBS) and inflammatory bowel disease, such as Crohn's disease and colitis.