our gut is also linked to your immune system. A gut that is inflamed can result in defective immune function, where your immune system over responds (overactive immune response) to a large molecule, toxin or microbe that has now passed across the inflamed gut wall. About 80% of the immune system is located in the gut. If you do not have a healthy gut you cannot have a healthy immune system. An unhealthy immune system can cause infections, inflammation and autoimmune diseases. The brain and the gut are connected. Stress can affect the brain and gut connection in a negative way, increasing the risk of gastrointestinal disorders such as Irritable Bowel Syndrome (IBS), Inflammatory Bowel Disease, peptic ulcers, gastro-oesophageal reflux disease.