Randomisation All participants will take all 4 fibre/ placebo preparations in this crossover trial but the order in which the participants take them will be randomised. The randomisation will be undertaken by a member of the research division who is independent of the study using the remote, online, open source software www.randomization.com. The resulting code will be retained by staff responsible for food preparation in paper form, and will not be shared with the investigator team. A paper copy will be kept by the CI in a sealed envelope.