The Study
Measuring the Phytochemical Richness of Meat: Effects of Grass/Grain Finishing Systems and Grapeseed Extract Supplementation on the Fatty Acid and Phytochemical Content of Beef
This study looked at what's inside beef from cows that ate grass vs. grain, and found that grass-fed beef has more good stuff like omega-3s and certain plant chemicals. But it didn't test whether eating this beef makes people healthier—it just shows what's different in the meat.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
Cows that eat grass make meat with more healthy fats and nutrients than cows that eat grain, even if you add grape stuff to the grain.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 519 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — a better omega-3 to omega-6 ratio is linked to lower inflammation and better heart health, and these nutrients are important for overall wellness.
- 2Grass-fed beef has 4.5–6x more omega-3s, 30–40% more CLA, more vitamin E, iron, and zinc.
- 3The healthy fat ratio (n-6:n-3) is 1.65:1 vs.
- 410:1 in grain-fed.
- 5Grape extract didn't help.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Foods
Year
2023
Authors
Lucas Krusinski, I. Maciel, S. van Vliet, Muhammad Ahsin, Guanqi Lu, J. Rowntree, J. Fenton
Related Content
Claims (6)
Grass-fed beef has 30–40% more conjugated linoleic acid and more vitamin E than grain-fed beef.
Beef from cows raised on pasture has higher levels of five specific phytochemicals—stachydrine, hippuric acid, citric acid, succinic acid, and fumaric acid—than beef from cows fed grain. Adding grapeseed extract to grain-fed cattle does not change these levels.
Beef from cattle fed a grain-based diet with 5% grapeseed extract for the last 30 days before slaughter has the same phytochemical content and fatty acid profile as beef from cattle fed the same grain-based diet without grapeseed extract.
Beef from cattle raised on biodiverse pasture has 4.5 to 6 times more omega-3 fatty acids and a fat profile of 1.65:1 n-6 to n-3 ratio, while beef from grain-fed cattle has a ratio near 10:1. This difference in fatty acid composition is associated with nutritional profiles that match dietary guidelines for heart and metabolic health.
Beef from cattle raised on pasture has higher levels of vitamin E, iron, and zinc than beef from cattle fed grain, and adding grapeseed extract to the grain diet does not change these nutrient levels.
Beef from cattle finished on pasture has a different n-6:n-3 fatty acid ratio and higher total n-3 PUFA content than beef from grain-finished cattle, and these two measurements are the most reliable for telling them apart.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.