Dietary cellulose and β-1,4-linked plant fiber polysaccharides

Dietary cellulose and other β-1,4-linked plant fiber polysaccharides are complex carbohydrates that form the structural framework of plant cell walls and are a primary component of insoluble dietary fiber [1]. These molecules consist of long, unbranched chains of D-glucose units connected by β-1,4-glycosidic bonds, a linkage that the human digestive system cannot hydrolyze due to the absence of endogenous cellulase enzymes [2]. In the intestinal lumen, these polysaccharides function as bulking agents that increase fecal mass and promote peristalsis, thereby reducing transit time and preventing constipation [3]. They also play a critical role in metabolic health by slowing the absorption of sugars and fats, and by serving as a substrate for fermentation by commensal gut microbiota, which produces beneficial short-chain fatty acids (SCFAs) like butyrate and propionate [4][5]. While not a traditional pharmacological target, they are the substrate for supplemental digestive enzymes (e.g., cellulase) and are central to dietary strategies for managing obesity, type 2 diabetes, and colorectal cancer [6]. Therapeutic challenges include potential gastrointestinal distress from rapid fermentation and the risk of intestinal obstruction if consumed in excess without adequate hydration [5].

Other names

Celluloseβ-1,4-glucanInsoluble dietary fiberPlant cell wall polysaccharidesRoughage

Enzymatic hydrolysis of β-1,4-glycosidic bonds; physical water retention and fecal bulking; microbial fermentation into bioactive metabolites.