Harvard Health Blog Gut feelings: How food affects your mood POSTED DECEMBER 07, 2018, 6:30 AM Uma Naidoo, MD, Contributor The human microbiome, or gut environment, is a community of different bacteria that has co-evolved with humans to be beneficial to both a person and the bacteria. Researchers agree that a person’s unique microbiome is created within the first 1,000 days of life, but there are things you can do to alter your gut environment throughout your life. What we eat, especially foods that contain chemical additives and ultra-processed foods, affects our gut environment and increases our risk of diseases. Learn more » Get your copy of The Sensitive Gut When your digestive system is running smoothly, you tend not to think about it. Once trouble begins, your gut — like a squeaky wheel — suddenly demands your attention. This Special Health Report, The Sensitive Gut, covers the major sources of gastrointestinal distress: irritable bowel syndrome, gastric reflux, upset stomach, constipation, diarrhea, and excess gas. It also includes a special Bonus Section describing how emotional stress and anxiety can cause gastrointestinal distress. More Blogs from Harvard Health Navigating tricky relationships during the holidays Safe and effective use of insulin requires proper storage Giving babies and toddlers antibiotics can increase the risk of obesity The Sensitive Gut Featured content: • Inside the gut • Special section: The Stress Connection • Gastroesophageal reflux disease • Antireflux drug therapy • Functional dyspepsia •  ... and more! Click here to read more »