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Thread: Scary thought about "Soy Milk"

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  1. #1
    Join Date
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    Quote Originally Posted by *Narkissos* View Post
    ^^Soy is complete.

    It's methionine and cysteine amounts are lower.

    This does not alter its complete status.

    -CNS
    Right on, soy is definitely complete just sulfur based amino's are lower. BUT I will say that biological value of soy is lower compared with cow milk.

    Nark do you know the value for soy...84 or something?

    Also I have supplemented with soy protein. When they make soy isolate they take out the inherent protease inhibitors and even add more methionine sometimes. Perfectly good protein source to use.

    But I also like to get my milk from Webb's utters.

  2. #2
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    Quote Originally Posted by C_Bino View Post
    Right on, soy is definitely complete just sulfur based amino's are lower. BUT I will say that biological value of soy is lower compared with cow milk.

    Nark do you know the value for soy...84 or something?
    Lower than cow's milk.. but not 'low'

    I forgot to include these arguments in my last article... but i may include them in my following article(s) (or the re-release of this article).

    Soy proteins of times past have been cheap gunk...no getting around that.

    Protein powders period have come a long way.

    According to the Benamouzig et. al. study of 1999 however, soy's bioavailability is 92% that of milk protein.[1]

    Which basically charts it as lower.. but far from 'low'.

    Something else associated with soy protein is claims of poor assimilation.

    In this study however:

    Oro-ileal digestibility of SPI nitrogen was 91%. The amount of absorbed SPI amino acids used for nonoxidative disposal, i.e., postprandial biological value, was 86% 8 h after meal ingestion. Hence, net postprandial protein utilization of SPI was 78%. Compared to previous data that were assessed under the same condition in humans, the nutritional value of SPI is 92% of that in milk protein concentrate.
    Thus, i do not believe digestibility is an issue.

    I myself get less issues with soy than i get with whey...

    This applies even to whey deemed 'lactose-free'.

    -CNS



    References:

    1. Benamouzig et. al. Nutritional Value of [15N]-Soy Protein Isolate Assessed from Ileal Digestibility and Postprandial Protein Utilization in Humans. Journal of Nutrition. 1999;129:1992-1997.


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