I believe that eating the right amount of essential fatty acids is almost orthogonal to the issue of eating animal products. (Again, for the record, I eat some)

Though grass fed beef has a much better Omega-6 to Omega-3 ratio (2:1) than grain fed beef (4:1), and it may have other benefits, there are many dietary switches that make a bigger difference in your diets overall ratio.

Flax seed and salmon oil have a far superior ratio, approximately 1:4.

http://en.wikipedia.org/wiki/Omega-3_fatty_acids#Meat http://www.pponline.co.uk/encyc/omega-3-omega-6.html