Health-promoting phytonutrients are higher in grass-fed meat and milk

Summary

This narrative review by van Vliet, Provenza, and Kronberg synthesises evidence on the phytonutrient composition of meat and milk from grass-fed ruminants relative to those raised on grain-based diets. The authors argue that phytochemicals consumed by grazing animals — derived from botanically diverse pastures — are transferred and retained in animal-source foods, potentially conveying nutritional benefits to human consumers. The paper contextualises these differences within broader debates about livestock feeding systems and diet quality, though as a narrative review it does not provide a systematic quantitative synthesis.

UK applicability

The findings are broadly applicable to UK pasture-based livestock systems, where grass-fed beef and dairy production is common and increasingly promoted under quality assurance schemes; UK producers and policymakers may find the phytonutrient argument supportive of high-nature-value and regenerative grazing approaches.

Key measures

Phytonutrient concentrations (carotenoids, tocopherols, polyphenols, omega-3 fatty acids, conjugated linoleic acid) in meat and milk from grass-fed versus grain-fed animals

Outcomes reported

The paper examines concentrations of health-promoting phytonutrients — including carotenoids, tocopherols, and polyphenols — in meat and milk from grass-fed compared to grain-fed ruminants, reporting higher levels in pasture-raised animal products.

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