Abdominal Pain, Barrett’s esophagus, Bloating & Distention, Carbohydrate Intolerances (Lactose, Fructose, Sucrose), Celiac Disease, Celiac Sprue, Cholecystectomy, Cholelithiasis, Chronic Disease, Constipation, Diarrhea, Diverticulosis / Diverticulitis, Dysbiosis, Dysmotility, Dyspepsia / Indigestion, Elimination Diets, Eosinophilic Esophagitis (EoE), Eosinophilic gastrointestinal disorders (EGID), Food Allergies / Intolerance, Food sensitivities, Gastritis, Gastroesophageal Reflux Disease (GERD), Gastroparesis, Gut Microbiome, Histamine-Related Syndromes, Hyperlipidemia, Intestinal Fermentation, Intestinal Gas, Intestinal Methanogen Overgrowth (IMO), Intuitive Eating, Irritable Bowel Syndrome (IBS), Leaky Gut, Low FODMAP Diet, LPR, Malnutrition, Mast Cell Activation Disorder (MCAD), Mediterranean Diet, Motility Disorders, Nausea, Non-Celiac Gluten Sensitivity (NCGS), Nonalcoholic Fatty Liver Disease (NAFLD), Pediatric Gastroenterology, Small Intestinal Bacterial Overgrowth (SIBO), Weight Management, Wellness Nutrition