(January 21, 2014 at 6:41 am)Chuck Wrote: Ahh, no, he is well informed in this case, you are the REALLY presumptuously ignorant one. There are enormous numbers of different proteins. In fact every specie of animal and plants have some protein that is unique to that species. On the whole there are specific proteins as well as families of proteins that characterizes each taxonomic group of life on earth. Which proteins it actually is, not just what substance the proteins is made of, is decisively important to how your body might deal with it.
No, Arctus is not informed, he doesn't understand what "quality" in relation to dietary protein actually means. Fundamentally, the amino acids that make up animal protein are chemically identical to that in plant proteins, which is what la dan was referring to (though some plants lack certain amino acids, on mass all essential amino acids that can be found in an animal can be found in a plant)
You are right though the breakdown of proteins into their constituent amino acids does vary by protein type, but its not as simple as meats have a higher quality than plants, eg soya protein (PDCAAS=1.00) is of a higher quality than beef (PDCAAS=0.92). But all these values mean is if one were to have the recommended amount protein in ones diet, by what ratio does the amino acid profile differ from that which is considered an ideal amount. But it doesn't take into account the fact that no one will only eat one source of protein(so that in sum the ratio can be ideal), or that one could simply eat more of a lower quality protein source and therefore not be protein deficient, or that just because something is not an ideal ratio does not mean that ill health will follow.
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Arctus, was arguing that animal protein was of a fundamentality different type, not just the amino acids are in different configurations to form different proteins, differences which affect digestibility.
