In this project the investigators aim to test whether it is possible to precisely measure the changes in fermentation gas patterns after supplementation of a complex fibre mixture over a 36-hour period in both lean normoglycemic and individuals with insulin resistance and/or prediabetes with overweight when compared with a placebo. Additionally, the investigators will investigate whether changes in fermentation patterns will be directly related to changes in carbohydrate and fat oxidation and to microbial composition or related metabolites and hormones in blood, faeces, and urine.
In this project the investigators will test if it is possible to measure changes in intestinal gas production after supplementation of a complex fiber mixture over a 36 hour period in both lean normoglycemic individuals and individuals with insulin resistance and/or prediabetes with overweight when compared with a placebo~Changes in intestinal gas production will also be related to energy expenditure, substrate metabolism, microbial composition and related metabolites in feces, blood and urine.