Dietary fiber is the part of plant-based food that mostly passes through your digestive system without breaking down or being digested.

Crude fiber refers to one type of dietary fiber, the type that remains as residue after food receives a standardized laboratory treatment with dilute acid and alkali.

Foods generally contain more dietary fiber than crude fiber, but no consistent quantitative relationship) exists between the two.

Dietary fiber is a type of carbohydrate that contains thousands or more of simple sugar units, especially glucose and benefit the human digestion system in cleaning and pushing the absorption residues from the food. The enzyme which digests these fibers is absent in human unlike many mammals whose main diet are fibers.

Crude fibers may contain fibers from non-food compounds such as polymers that do not fit into human food.

Prince Nkemakolam Okoroh

Dietary fiber is the sum of soluble and non soluble fiber from plant based foods which contains pectins, gums, and mucilage, while crude fiber is the insoluble part of cell wall of plants which is mostly consisted of cellulose (and also lignin in woody plants). Crude fiber is less fermentable and may only have some benefits in peristaltic movement while dietary fiber is highly fermentable and may positively affect bowel movement and metabolism like lipid profile and glycemic control.

Dear Dr. Prince Okoroh,

• It refers to nutrients in the diet that are not digested by gastrointestinal enzymes but still fulfill an important role.
• As indigestible complex carbohydrates, dietary fibers perform important biological functions, though they supply no calories or nutrients and are resistant to digestive enzymes.
• Mostly found in vegetables, fruits, whole grains, and legumes, fiber has a host of health benefits, including reducing the risk of heart disease and diabetes.
• Dietary fiber includes polysaccharides, oligosaccharides, lignin, and associated plant substances.
• Dietary fiber comes from the walls of plant cells and includes cellulose, hemicellulose, lignin, pectin, mucilage, and gum.
• Many food products list total fiber content in grams, which includes both soluble and insoluble fiber.

• It is a measure of the quantity of indigestible cellulose, pentosans, lignin, and other components of this type in present foods.
• Crude fiber refers to one type of dietary fiber, the type that remains as a residue after food receives a standardized laboratory treatment with dilute acid and alkali.
• The treatment dissolves all the soluble fiber and some of the insoluble fiber in a food.
• The residue or crude fiber is primarily composed of cellulose and lignin.
• The determination of the crude fiber content of food and animal feed is mandatory worldwide.
• It is known as the part of carbohydrate in food called non-soluble carbohydrate (Insoluble carbohydrates), which is not digested by the digestive juices and does not degrade at the treatment by ( acids and bases ) diluted and in specific concentrations for a period of time is limited.
• The treatment of some food such as legumes, grains, and seeds, for example in weak acid and weak base results is Soluble sugars and protein leaving behind the non-dissolved part like (Cellulose and hemicellulose ) and (Lignin) of the composition.
• Crude fiber is a nutritionally obsolete term, according to the National Research Council's Commission on Life Sciences.
• Crude fiber measurements, the result of lab analysis, may underestimate the actual dietary fiber in a food item by 50 percent or more.

I hope the information will help you.

With Best Wishes,

Samir G. Pandya

Good information

Good sharing to understand the relation of crude fiber and dietary fiber.

I appreciate the difference between crude fiber and dietary fiber that have been made by estimated colleagues

Good information

Dietary fiber are component of the food with no nutritional value but aid movement of the digestive tract

Thank you for sharing for the purpose of proximate analysis on human food or snacks which of the 2 (dietary fibre and crude fibre) should be estimated and why@

For the purpose of proximate analysis result of a particular food sample, you account for crude fibre.

According to AOAC, you estimate the crude fibre. Actually, the dietary fibre is a term for the nondigestible portion , which may not actually be fibrous but have no nutritional value.

thank you for this helpful response Sir Adekunle Olusegun Adeoye

Thankyou sir..