I grew up on a small farm and we sometimes slaughtered cattle for our family to consume. As far as I knew at the time, all beef was "grass fed". As I got older and traveled to different areas of the country, I learned that the majority of beef we purchase from a supermarket is not grass-fed but rather grain fed - on feed lots.
According to this article published on IdealBite.com, we should all consider eating more grass fed beef. "Grass-fed beef, bison, and lamb have less total fat, cholesterol, and calories than grain-fed. And grass-fed is a good source of potentially-cancer-blocking conjugated lineolic acid." Not to mention that grazing is usually better for the environment versus feed lots.
Click here to find places to purchase grass fed beef.