Summary
This narrative review examines the evidence linking dietary polyphenol consumption to chronic disease prevention. Whilst experimental studies in animals and cell lines suggest protective effects against cardiovascular disease, cancer, neurodegeneration, diabetes, and osteoporosis, clinical translation remains unclear due to dose discrepancies between research and human dietary levels. Epidemiological evidence supports reduced myocardial infarction risk with tea and wine consumption, but associations with cancer risk remain inconclusive; the authors conclude that more rigorous human studies are required to establish clear health protective effects and to evaluate safety at high intakes.
Regional applicability
The review is based on international research evidence and does not address United Kingdom-specific populations or dietary patterns. However, the findings are broadly applicable to UK dietary contexts, where tea, coffee, wine, fruits, and vegetables are common polyphenol sources. The call for improved human clinical evidence and epidemiological research remains relevant to UK nutrition science and public health policy.
Key measures
Biomarkers of oxidative stress, cardiovascular disease risk factors, tumour biomarkers, bone resorption biomarkers, polyphenol intake levels, myocardial infarction risk
Outcomes reported
The review synthesised evidence from experimental, clinical, and epidemiological studies on polyphenol intake and prevention of cardiovascular diseases, cancers, neurodegenerative diseases, diabetes, and osteoporosis. It evaluated the gap between preclinical findings and documented human health effects.
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