Fibers are non-digestible carbohydrates, meaning that our bodies do not assimilate them directly to convert them into energy. They reach our colon intact, where they are fermented by our microbiota. The metabolites produced by fermentation have direct and indirect impacts on our health: balancing the intestinal flora, producing energy for local cells, regulating metabolism and activating satiety hormones.
In addition to nourishing our intestinal flora, fiber has multiple roles to play in our health: in particular, it helps control blood sugar levels, regulates intestinal transit and reduces cholesterol.
Fiber is found notably in fruit, vegetables and wholegrain cereals. A fiber-rich diet, recommended at 25 to 30 grams a day for adults, is important for reducing the risk of several chronic diseases, including obesity and type 2 diabetes. 

For further information, we recommend that you consult :

- The MangerBouger.fr website
- The Santé Publique France website, and its nutrition and physical activity section
- The website of ANSES, the French Agency for Food, Environmental and Occupational Health and Safety, and its food and human nutrition section.
- French Nutrition Society website
- The report of the PNNS, Programme Nationale de Nutrition et Santé (2018-2023), which defines all nutritional recommendations