Dietary Fiber Effects on Lipid Metabolism
Summary
Dietary fibre encompasses a diverse group of non-digested carbohydrates that exert profound effects on lipid metabolism. Soluble fibres form viscous gels in the small intestine, delaying nutrient absorption, binding bile acids and promoting their excretion, which in turn stimulates hepatic conversion of cholesterol into new bile salts. Fermentable fractions are metabolised by colonic microbiota into short-chain fatty acids, notably acetate, propionate and butyrate, which modulate hepatic lipid synthesis and plasma lipoprotein concentrations. Insoluble fibres augment faecal bulk and transit, indirectly affecting lipid homeostasis. Collectively, these mechanisms contribute to reductions in total and low-density lipoprotein (LDL) cholesterol, improvements in triglyceride profiles and attenuation of cardiovascular risk. The global significance of these effects underpins dietary guidelines recommending increased intake of whole grains, pulses, fruits and vegetables. Advances in processing, fibre structure and personalised nutrition are now informing the development of functional foods designed to optimise lipid-lowering efficacy in diverse populations.
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Dietary Fiber Effects on Lipid Metabolism publication trend
The graph below shows the total number of articles in dietary fiber effects on lipid metabolism across all publications each year (not limited to Nature Index journals).
Technical terms
Soluble dietary fibre: Non-digested carbohydrates that dissolve in water to form viscous gels in the intestine, slowing nutrient absorption and binding bile acids.
β-Glucan: A soluble polysaccharide found predominantly in oats and barley, characterised by mixed β-(1→3) and β-(1→4) linkages, responsible for viscosity-mediated cholesterol lowering.
Short-chain fatty acids: Metabolic products (acetate, propionate, butyrate) of microbial fermentation of fibre in the colon, which regulate hepatic lipid synthesis and gut hormone release.
Bile acids: Steroid compounds synthesised from cholesterol in the liver and secreted into the intestine; their binding by soluble fibre reduces enterohepatic recirculation of cholesterol.
Low-density lipoprotein (LDL) cholesterol: The primary form of circulating cholesterol involved in arterial plaque formation; elevated levels are strongly linked to cardiovascular disease.
References
- Cereal B-Glucans: The Impact of Processing and How It Affects Physiological Responses. Nutrients (2019).
- A Randomized Placebo-Controlled Clinical Trial to Evaluate the Medium-Term Effects of Oat Fibers on Human Health: The Beta-Glucan Effects on Lipid Profile, Glycemia and inTestinal Health (BELT) Study. Nutrients (2020).
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