Over a period of 6 weeks, volunteers will ingest SATIOSTAT as meal replacement at lunch and as first course at dinner. Once before and after these 6 weeks the investigators will carry out an oral glucose challenge, measure satiation hormones and examine faeces (gut microbiota). Volunteers will fill in a food diary and a questionnaire for gastrointestinal symptoms and quality of life. The whole study will take approximately 8-10 weeks.