The fibers are complex carbohydrates not assimilated by the body. They include for example the following fibers:
hard fibers such as lignin (bran, fruit skins, cabbage …).
pectin (fruit), cellulose (vegetable), hemicellulose (plant shoots), agar (seaweed) …
lectins (cereal …).
The fibers are not all good for our organization. The lectins, which are found especially in cereals, are glycoproteins that have the ability to bind and interact with every cell of our body. They make our gut more permeable and allow many toxins end up in our blood. They themselves can cross the intestinal barrier to our being in our blood, they also have a capacity for harm. The result: they are now recognized a cause of autoimmune diseases.
The fibers are not absorbed by the body. Depending on their composition, they are fermented by intestinal flora intact or rejected. Some fibers absorb several times their volume of water, which speeds up intestinal transit. They can therefore fight against constipation, hemorrhoids, hernias.
The fibers are also involved in protection against certain cancers: Improved intestinal transit, faster elimination of bile acids. Some fibers absorb the estrogen produced in the intestine. But high levels of estrogen associated with breast cancer.
Foods that are closest to their natural state, especially with their skin, not refined, are those which contain more fiber (vegetables, whole fruits, peas, lentils, whole grains).
The publicity surrounding bases produced grain for their content “high fiber” is misleading for two reasons:
The majority of fiber we eat comes from fruits and vegetables. Eating cornflakes for breakfast is much less beneficial from this point of view that eating an apple.
The lectins that contain grains are fiber, but they are believed to be a major cause of chronic autoimmune (celiac disease, rheumatoid arthritis, Crohn’s disease, colitis, dermatitis herpetiformis, multiple sclerosis, psoriasis, allergies, asthma …). The fibers are not all good, especially grain, but the importance of cereals is not explained here.