Should we be buying free-range or grass-fed beef? And which is better ... let's tackle one of the biggest distinctions of all. Organic versus certified beef: What's the difference?

Cynthia is board certified as a specialist in sports ... Some differences exist between grass-fed, grain-fed, and organic beef. Most cattle are grain-fed. Grain-fed cows eat grass early in life ...

Whole Foods' organic grass-fed beef burgers were smaller than the other patties. The Whole Foods burger patties were the most expensive of the three, at $8.50 for four ¼-pound patties.

When shopping for beef at the grocery store, you may often see the words "organic" and "grass-fed." Here are the key ...