The Effect of Natural Carbonated Mineral Water Consumption on Gastrointestinal Transit and Gut Microbiota - A Randomized Controlled Trial

Inclusion Criteria: * Age between 18 and 70 years * History of gastrointestinal discomfort * Not using any laxative drug for 3 days before the screening visit * Drinking 1.0 ± 0.5 L of water per day * Accepting and signing the informed consent Exclusion Criteria: * Treatment or disease (current or past) likely to interfere with evaluation of the study parameters * Taking antibiotics in the 3 months preceding the recruitment visit * Taking supplements or any food enriched with or containing bacteria or yeasts likely to have an effect on the gastrointestinal tract, particularly on intestinal transit, digestive comfort, gas production, or the occurrence of abdominal pain, in the 30 days preceding the recruitment visit (these products will also be banned during the study period) * Subject having an alcohol consumption of more than 3 glasses of wine per day, or 2 glasses of beer per day, or 1 glass of hard liquor per day * Subject having a coffee consumption greater than 5 cups per day * Subject with constipation attributable to an organic or anatomical cause (Hirschsprung's disease, hypothyroidism, mental deficiency, psychiatric illness, neurological abnormalities, history of operation of the colon or anus, colorectal cancer, anemia, etc.) * Subject with a history of current gastrointestinal pathology or disorder such as duodenal ulcer, chronic colitis, or chronic inflammatory disease of the gastrointestinal tract (Crohn's disease, ulcerative colitis), celiac disease, or irrit…