1.   Complementing the action of insoluble fibres, some soluble fibres also add to faecal bulk and increase its water content.

2.   Large amounts of insoluble fibre dilute the concentration of potential carcinogens that may be present in the stool.

3.   Large amounts of insoluble fibre increase faecal bulk and draw water into the large intestine.

4.   Wheat bran does not have the same sustained energy impact as oats because it is made up of insoluble fibre which acts as a natural laxative.