seeker242 wrote:I don't think it's an arguable point as there is no scientific evidence to back that statement up. Protein is simply amino acids combinations.
There are these issues:
Protein should have balanced, complete amino-acid profile, and easily digested.
Even though some nuts and seeds do contain all essential amino-acids, I wonder how easy it is for the body to absorb them.
I would agree that this information is not correct or presents an inaccurate picture. The PDCAAS is considered "the preferred 'best'" method to determine protein quality by the US Food and Drug Administration (FDA) and the Food and Agricultural Organization of the United Nations/World Health Organization. Other methods are considered by these organizations to be inferior evaluation methods. Unfortunately your chart does not show what method was used to come to those numbers or it's source. I would be intetested in seeing that if someone knows. Here are the PDCAAS numbers. http://en.wikipedia.org/wiki/Protein_Di ... Acid_Score
1.00 casein (milk protein)
1.00 egg white
1.00 soy protein
1.00 whey (milk protein)
0.99 mycoprotein (Quorn, etc.)
0.75 black beans
0.70 Other legumes
0.59 cereals and derivatives
0.42 whole wheat
As you can see from the above chart, soy and mycoprotein are both superior quality to beef. I'm curious as to where amaranth, buckwheat, quinoa, and spirulina would fall on the above chart. I would not be surprised if any of them scored above beef also.
Experts these days agree with the below.
"With three important exceptions, there is little danger of protein deficiency in a plant food diet. The exceptions are diets very heavily dependent on  fruit or on  some tubers, such as sweet potatoes or cassava, or on  junk food (refined flours, sugars, and fat). Fortunately, relatively few people in the world try to survive on diets in which these foods are virtually the sole source of calories. In all other diets, if people are getting enough calories, they are virtually certain of getting enough protein."
As far as "complete amino acid profile" or "complete protein", the "incomplete" label is misleading for many, many foods. Regular potatoes are considered "incomplete protein". However, potatoes contain ALL essential amino acids, just in different quantities. If you ate 2,500 calories of nothing but potatoes every day, you will still be exceeding the recommendation for ALL essential amino acids.
Even if you ate nothing but potatoes, every day, you would be lacking nothing with regards to protein quality or quantity. Potatoes are just one example.