The relative merits of grass fed versus grain fed red meat has been a source of debate for some time. Dr. Gary Egger published a study the British Journal of Nutrition in September 2010 which analysed the benefits of kangaroo meat. Explained Dr Gary Egger, “It’s meat from lean animals that run around and eat grass. Wagyu on the other hand is relatively new to the food supply and an example of modern meat from modern animals that are less active and often fed on grain.”
In the article, Dr. Magryta: Grain or grass fed meat? some of the reasoning behind Dr Egger’s analysis is detailed.