Dietary fibres can be defined as non-digestible carbohydrate and lignin, that are intrinsic and intact in plants that have beneficial physiological effects in humans such as increases the faecal bulk, stimulates colonic fermentation, reduces postprandial blood glucose (reduces insulin responses) and reduces pre-prandial cholesterol levels. Oat bran, barley bran, and psyllium, mostly soluble fibre, have earned a healthy reputation for their ability to lower blood lipid levels. Wheat bran and other more insoluble fibres are typically linked to laxative properties.