Dietary fiber is based on physiological function and analysis methods oriented to the definition of the components contained in a very complicated, coupled with modern technology and the rapid development of the food industry, there has been a lot of similar nature of dietary fiber food ingredients, such as anti - of starch, oligosaccharides and polysaccharides, such as Jerusalem artichoke, making the previous limitations of the definition of dietary fiber are becoming evident. As people of important physiological functions of dietary fiber awareness, there have been many types of dietary fiber food, it is necessary to give it a precise definition of a unified situation.

1998 AACC established a definition of dietary fiber special committee in 1999, the academic definition of dietary fiber on the unity of the discussion questions are extremely active in a series of meetings and symposia. March 7, 1999, regarding the definition of dietary fiber of the web site opened, less than 10 days there is more than 100 from the United States, Canada, Argentina, Australia, Brazil, Germany, New Zealand, Finland, Peru and other countries of the scientists on the diet the definition of fiber-line discussion,These members representing academia, public sector, sector regulations and policies, business and so on. June 1999 2 ~ 3 day, AACC and the International Life Sciences Council (ILSI) jointly established the definition of dietary fiber on the work of the Committee on the precise definition of dietary fiber for discussion and consensus. July 26, 1999, IFT Annual Meeting held in Chicago on this issue a special forum; November 2 the same year, at 84th AACC Annual Meeting, held a special meeting on the definition of dietary fiber were discussed,Finalized the definition is as follows:

Dietary fiber refers to anti-human digestion and absorption, and in the human large intestine can be partial or total fermentation of the edible plant-derived ingredients, carbohydrate and the sum of similar substances, including polysaccharides, oligosaccharides, lignin and related Plant material. Dietary fiber has Runchang Tongbian, regulating control of blood glucose concentration, blood fat, such as one or more physiological functions.The above definition clearly defines the main component of dietary fiber, dietary fiber is an edible plant ingredients, rather than animal ingredients, including cellulose, hemicellulose, pectin and hydrophilic colloidal substances, such as gums, many algae sugar composition; including plant cell walls also contained in lignin; not by human digestive enzymes break down substances, such as resistant starch, resistant dextrin, resistant oligosaccharides, modified cellulose, sticky quality, as well as a small amount of oligosaccharides related components, such as waxed paper, horny, cork grease, etc..