Antidiabetic Properties of Medicinal Plants

Medicinal plants have long served as complementary or alternative approaches to glycaemic control, drawing on a rich diversity of bioactive compounds that modulate multiple pathophysiological pathways in diabetes. Phytochemicals such as flavonoids, alkaloids, terpenoids and polysaccharides act through mechanisms including inhibition of carbohydrate-digestive enzymes, enhancement of insulin secretion or sensitivity, attenuation of oxidative stress and regulation of lipid metabolism. Many extracts demonstrate α-glucosidase and α-amylase inhibition in vitro, while others improve insulin signalling and pancreatic β-cell function in animal models. Antioxidant activities counteract the damaging effects of chronic hyperglycaemia, and some preparations lower triglycerides and cholesterol, addressing comorbid dyslipidaemia. The global significance of these findings lies in the potential to develop standardised, affordable phytomedicines, particularly in regions where conventional therapies remain costly or inaccessible. Despite promising preclinical data, translation into well-controlled clinical trials remains limited. Key challenges include variation in extract composition, identification of active constituents, safety profiling and potential herb–drug interactions. Continued interdisciplinary research is essential to harness traditional knowledge, optimise extraction and formulation methods, and advance lead compounds along the drug discovery pipeline.

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Antidiabetic Properties of Medicinal Plants publication trend

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Technical terms

Alpha-glucosidase: An intestinal enzyme that hydrolyses oligosaccharides into glucose, targeted to slow carbohydrate absorption.

Alpha-amylase: A digestive enzyme that breaks down starch into simple sugars, inhibition of which reduces postprandial glycaemia.

Aldose reductase: An enzyme in the polyol pathway that converts glucose to sorbitol, implicated in diabetic complications.

Dipeptidyl peptidase 4 (DPP-4): A serine protease that degrades incretin hormones, modulation of which enhances insulin release.

Flavonoid: A class of polyphenolic plant secondary metabolites noted for antioxidant, anti-inflammatory and enzyme-inhibitory activities.

References

1. Antidiabetic Potential of Medicinal Plants and Their Active Components. Biomolecules (2019).
2. Potential of traditionally consumed medicinal herbs, spices, and food plants to inhibit key digestive enzymes geared towards diabetes mellitus management — A systematic review. South African Journal of Botany (2019).
3. Exploring African Medicinal Plants for Potential Anti-Diabetic Compounds with the DIA-DB Inverse Virtual Screening Web Server. Molecules (2019).
4. Antidiabetic compounds from medicinal plants traditionally used for the treatment of diabetes in Africa: A review update (2015–2020). South African Journal of Botany (2022).