Fibre is the substance that makes up the cell walls of plants and passes through the body without being digested. It provides the bulk that ensures food is processed quickly through the bowels and because of the nature of their diet, vegetarians have a higher fibre intake than meat eaters. The fact that fibre speeds waste products through the body reduces the time that noxious agents – possibly cancer forming agents – spend in the intestines. It also affects the rate at which glucose (sugar) is released and absorbed and so helps reduce the chance of diabetes. Fibre also reduces the urge to eat and so it helps with appetite control – according to the WHO. Not surprisingly, diets high in fibre give a lower risk of heart disease and some cancers.