A review of fatty acid profiles and antioxidant content in grass-fed and grain-fed beef

Summary

This narrative review synthesises published evidence on the nutritional differences between grass-fed and grain-fed beef, with particular focus on fatty acid profiles and antioxidant concentrations. Drawing predominantly on US and European studies, the review finds that grass-fed beef generally contains higher levels of omega-3 fatty acids, a more favourable omega-6:omega-3 ratio, greater CLA concentrations, and higher levels of fat-soluble antioxidants such as vitamin E and beta-carotene compared with grain-fed counterparts. The authors conclude that these differences may have implications for human dietary health, particularly in relation to cardiovascular and inflammatory disease risk.

UK applicability

Although the reviewed studies are largely from the US and Europe, the findings are broadly applicable to UK pasture-based beef systems, where grass-fed production is well established and increasingly aligned with both consumer health interest and agri-environment policy objectives such as those under the Sustainable Farming Incentive.

Key measures

Omega-3 fatty acid concentration (mg/g); omega-6:omega-3 ratio; conjugated linoleic acid (CLA) content; vitamin E (alpha-tocopherol) levels; beta-carotene content; total antioxidant capacity

Outcomes reported

The review compared fatty acid composition (including omega-3, omega-6, and CLA levels) and antioxidant content (including vitamin E, beta-carotene, and glutathione) between grass-fed and grain-fed beef. It assessed whether pasture-based feeding systems produce nutritionally superior beef relative to conventional grain-fed systems.

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