Dietary fiber refers to the part of foods which cannot be digested by the body but which, nevertheless, is an important part of nutrition. Fiber is contained in cereals, fruits and vegetables. Fiber binds water and swells in the stomach which causes a feeling of satiation. It also supports useful bacteria which are important for intestinal function. Fiber can bind organic substances such as cholesterol or carcinogenic materials which are then excreted together with the fiber (reduction of cholesterol levels and of cancer risk).
The recommended daily intake of fiber is 30g from sources such as whole-grain products and pulses (peas, lentils, beans, corn).