Grass-fed beef is better than ordinary (grain-fed) beef because it has a better omega-3/omega-6 ratio. I’ve heard this a thousand times. It’s true. Grass has more omega-3 than grain, which is high in omega-6. But it is misleading. For practical purposes, grass-fed and grain-fed beef are the same in terms of omega-3 and omega-6.
Peter Ballerstedt made this point in his talk at the recent Ancestral Health Symposium. He showed this slide, based on research by Susan Burkett.
This shows the amount of omega-3 and omega-6 in one serving of various foods. The amounts in grass- and grain-fed beef are small relative to other foods most people eat. People who have said eat grass-fed beef, such as Michael Pollan, should have been saying eat less chicken. When I started eating grass-fed instead of grain-fed beef, I noticed no differences, which agrees with this analysis.