Fiber Tolerance Study

Inclusion Criteria: 1. Age ≥ 45 and ≤ 70 years 2. Body Mass Index (BMI) ≥ 18.5 and ≤ 29.9 kg/m2 3. Signed consent form 4. Willingness and ability to comply with the protocol 5. Good general health 6. Defecation frequency: between three bowel movements per week and three bowel movements per day within a month for screening. Exclusion Criteria: 1. Presence or history of chronic gastrointestinal disorders (e.g. stomach ulcers, ulcerative colitis, Crohn's disease) or history of abdominal surgery with resection of the bowel (small or large intestine). 2. Presence of other medical conditions where gastrointestinal function often/probably is affected, such as: 1. autoimmune diseases (e.g. diabetes mellitus type I, multiple sclerosis, systemic lupus erythematosus). 2. eating disorders (e.g. anorexia nervosa, bulimia nervosa, binge eating disorder). 3. intestinal/gastrointestinal disorder due to a stroke. 3. Chronic diseases (including but not limited to hypertension, dyslipidaemia, type 2 diabetes mellitus, thyroid disorders) that cannot be controlled with the use of medication/therapy. 4. Severe acute liver disease or chronic liver disease. 5. Severe or chronic kidney disease or need for hemodialysis. 6. Colonoscopy, irrigoscopy or other bowel cleansing, or other surgical procedures related to the gastrointestinal tract (eg. colon polypectomy, appendectomy) or for which use of systemic antibiotics within 1 month before the screening is required or scheduled during participation in the study. 7. Use of enemas, laxatives, antacids, proton pump inhibitors, prokinetics (e.g. metoclopramide, drugs that affect motility), digestive enzymes, narcotic/morphine analgesics within 1 week prior to screening or intended use during participation in the study. 8. Following a vegetarian or vegan diet.