I mean, isn't ground beef just ground up steak basically?
asked byStephen_4 (10989)
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on April 23, 2013
at 01:47 PM
Okay, so the reason Ground Beef has a lower Amino Acid Completeness score, and why it is a poorer source of protein than pure steak seems to be because regular ground beef tends to include more than just the muscle meat of the cow. It might include some
- Skeletal tissue
- Connective tissue
- Blood vessels
- Peripheral nerve tissue
- Plant material
- Adipose tissue
- Bone and Cartilage
- Source: http://en.wikipedia.org/wiki/Ground_beef
Because the ground beef can include more than just the pure muscle, it might be combined with more incomplete proteins, like gelatin (from the connective tissue) which is an incomplete protein and contains no tryptophan. This would help explain why ground beef is less of a complete protein than steak since it is combined with more incomplete proteins which are low or absent in tryptophan.
This is my best guess answer, I'm pretty sure it's right, but if you have more information on the subject please do share :).