Effect of Prebiotic in Type 2 Diabetes (Diabetes and Health Study)

The study will be conducted in males and females with type 2 diabetes managed by diet and lifestyle alone.

The participants who meet the inclusion and exclusion criteria of the study will attend a screening visit where they will complete a medical screening and sign the consent form for participation in the study. Participates will visit the Human Nutrition Unit at the Rowett Institute to provide samples at week 0 (baseline), week 6 and week 12.

Participants' height, weight, and blood pressure will also be recorded. The investigators will measure HbA1c by a finger prick blood sample to confirm whether participants are a prediabetic or type 2 diabetic subjects. A 3-day weighed intake food diary will be completed during the initial washout period (minimum of 7 days) of the study in order to note their normal eating habits. No probiotic or prebiotics to be consumed during washout period and study period.

During the study periods, participants will take 20ml of prebiotic daily over the 12 consecutive weeks.

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.