Summary
This narrative review synthesises epidemiological and clinical trial evidence on the health effects of key phytonutrient classes — including polyphenols, carotenoids, organosulfurs and isoflavones — and situates these findings within a farming systems framework. Drawing on published meta-analyses, including those by Brandt, Barański and Czech, it argues that organic and pasture-based production systems tend to yield higher phytonutrient concentrations in both plant and animal foods. The review identifies a substantive evidence gap between farm-level nutrient enrichment and directly measured clinical health outcomes in human populations, and closes with practice-oriented recommendations for producers and nutrition professionals.
UK applicability
Although the review is global in scope, its recommendations and cited evidence are highly applicable to UK farming policy and practice, particularly given ongoing debates around agroecological transition, organic standards, and nutrient density in the context of post-Brexit food strategy.
Key measures
Polyphenol, carotenoid, organosulfur and isoflavone concentrations in foods; cardiovascular and cancer risk estimates from epidemiological studies and RCTs; antioxidant and total phenolic content differences between farming systems (organic vs conventional); omega-6:omega-3 ratios in animal products
Outcomes reported
Reviews phytonutrient concentrations across plant and animal foods and their associations with cardiovascular and cancer risk reduction; examines how organic versus conventional farming practices modulate antioxidant and phenolic content in food crops and animal products.
Topic tags
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