Review article on crude fiber

Madhu Chandaka

doi:10.37022/tjmdr.v5i3.786

Chandaka Madhu Department of Pharmacy, Gokul College of Pharmacy, Piridi, Bobbili, Vizianagaram (Dist), Affiliated to JNTU-Gurajada Vizianagaram

DOI https://doi.org/10.37022/tjmdr.v5i3.786

Abstract

Crude fiber represents the indigestible fraction of plant-derived foods that remains after sequential acid and alkali digestion and mainly consists of cellulose and lignin. Although traditionally used as a nutritional parameter in food and animal feed analysis, crude fiber estimation provides only a partial representation of total dietary fiber. This review article aims to summarize the definition, physiological significance, health benefits, limitations, disease-modulating effects, dietary requirements, food sources, and analytical methods related to crude fiber. Crude fiber plays an important role in maintaining digestive health by increasing stool bulk, improving bowel motility, and preventing constipation. It also contributes to weight management, glycemic control in diabetes, reduction of cardiovascular risk through cholesterol regulation, and lowering the risk of certain cancers by diluting intestinal carcinogens and reducing transit time. However, the conventional crude fiber method underestimates total dietary fiber as it excludes soluble fiber components such as pectins and gums and may lead to nutrient loss during harsh chemical extraction. The review also discusses daily fiber intake recommendations across age groups, commonly consumed fiber-rich plant sources, and analytical techniques, including the traditional Weende method and modern enzymatic-gravimetric methods. Overall, while crude fiber analysis remains relevant for animal nutrition and basic food evaluation, modern dietary fiber assessment methods provide a more comprehensive and accurate understanding of fiber’s role in human health.

Keywords: Crude fiber, Dietary fiber, Cellulose, Lignin, Digestive health, Constipation prevention, Glycemic control, Cardiovascular health, Cancer prevention, Weende method, Enzymatic-gravimetric analysis

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