Similar to a previous dissection they had performed on hot dogs, the researchers discovered waste and by-products including connective tissue, nerve tissue, cartilage, bone, and in a quarter of the samples, Sarcocystis parasites. But surely these “fillers” were the minority, right? Unfortunately not. After crunching the numbers, the researchers found that the amount of actual meat (muscle flesh) in the burgers ranged from 2.1 percent to 14.8 percent.

via Michael Greger, M.D.: Pink Slime: All About the Green.