For the study visits, each participant will undergo, on two separated occasions, an OGTT, with and without the product at week 0 (to assess acute effects, prior to chronic ingestion) and at week 12 (to assess acute effects after chronic ingestion). The two OGTTs (with and without test product) will be separated by a period of 48 hr. Thus, each participant will have four OGTTs during the study. To minimise systematic errors, one half of the participants will start with the test product OGTT and the other half will start without product OGTT. The starting order will be determined randomly. Six blood samples will be collected during the course of 3 hours (0, 30, 60, 90,120 and 180 min) using a cannulation after consuming 75 g of Polycal liquid (glucose load). Together with OGTT, breath samples will be taken every 30 min for measuring hydrogen and methane.