The Hidden Root Cause of IBS That 300 Million People Need to Know About
Dr. Will Bulsiewicz, a board-certified gastroenterologist and ZOE's US Medical Director, explains that IBS affects one in three GI patients and up to 40% of people globally experience chronic digestive issues. Unlike traditional symptom-focused approaches, he reveals that IBS stems from gut microbiome damage - specifically loss of anti-inflammatory microbes and increase in inflammatory ones. The condition involves the gut-brain axis, where 500 million gut nerves (five times more than the spinal cord) communicate with the brain via the vagus nerve. This explains why 50% of IBS patients also have depression or anxiety. Stress hormones can disrupt gut motility and barrier function, while gut microbes influence serotonin production (90-95% made in gut) that controls digestive rhythm. The Bristol Stool Scale helps identify problematic patterns, with type 4 being optimal. Modern lifestyle factors have increased IBS prevalence, but understanding the root microbiome dysfunction opens new treatment pathways focused on healing rather than just managing symptoms.