Phytosterols and Cholesterol Metabolism

Phytosterols are plant‐derived sterols that share the steroid nucleus of cholesterol but carry methyl or ethyl side chains at C24. Phytostanols are the saturated counterparts, differing only in the absence of the double bond between C5 and C6. Neither class is synthesised in humans; their principal action is to compete with dietary and biliary cholesterol for incorporation into mixed micelles in the small intestine, thereby reducing cholesterol absorption and lowering circulating low-density lipoprotein cholesterol (LDL-C). The displacement of cholesterol from micellar phases triggers compensatory changes in hepatic cholesterol synthesis, often monitored by biomarkers such as lathosterol and cholestanol. Intake levels of around 2–3 g per day yield reductions in LDL-C of up to 12 %, with modest effects on triglycerides and negligible impact on high-density lipoprotein cholesterol. Phytosterol enrichment in foods and nutraceuticals has been adopted widely to combat hypercholesterolaemia, but interindividual variability—characterised by “hyper-absorber” or “hyper-synthesiser” phenotypes—influences efficacy. Emerging data suggest possible anti-inflammatory and anti-atherosclerotic effects beyond lipid lowering, although long-term cardiovascular outcome trials are still needed. Bioavailability and delivery matrices remain critical factors for clinical translation, as chemical structure, esterification, food vehicle and processing can all modulate intestinal uptake and systemic distribution. Overall, phytosterols offer a non-pharmacological adjunct to lipid-lowering strategies with global relevance to public health and personalised nutrition.

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Phytosterols and Cholesterol Metabolism publication trend

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Technical terms

Phytosterols: plant‐derived sterol compounds structurally similar to cholesterol.
Phytostanols: saturated derivatives of phytosterols lacking the double bond at C5–C6.
Mixed micelles: aggregates of bile salts, phospholipids and lipids in the small intestine facilitating lipid absorption.
Low‐density lipoprotein cholesterol (LDL‐C): primary carrier of cholesterol in plasma, often referred to as ‘bad cholesterol’.
Hyper‐absorber: individual who absorbs dietary cholesterol at a higher rate relative to endogenous synthesis.
Hypersynthesiser: individual whose hepatic cholesterol synthesis predominates over intestinal absorption.

References

1. Phytosterols: From Preclinical Evidence to Potential Clinical Applications. Frontiers in Pharmacology (2021).
2. LDL-cholesterol-lowering effect of plant sterols and stanols across different dose ranges: a meta-analysis of randomised controlled studies. British Journal Of Nutrition (2014).
3. Phytosterols, Phytostanols, and Lipoprotein Metabolism. Nutrients (2015).
4. Plant sterols and stanols: effects on mixed micellar composition and LXR (target gene) activation. Journal of Lipid Research (2005).
5. Plant sterols: factors affecting their efficacy and safety as functional food ingredients. Lipids in Health and Disease (2004).