Free amino acids vs Whole foods

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    Free amino acids vs Whole foods


    Here’s a little protein information for your digestion quoted from "Advanced Nutrition and Human Metabolism", 4th Edition, pg 184:

    "Ingesting free, crystalline L-amino acids is thought by many athletes to be superior to ingesting natural foods containing protein for muscle protein synthesis. However, amino acids using the same carrier system compete with each other for absorption. Thus, ingesting one amino acid or a particular group of amino acids that use the same carrier system may create, depending on the amount ingested, a competition between the amino acids for absorption. The result may be that the amino acid present in the highest concentration is absorbed but also may impair the absorption of the other, less concentrated amino acids carried by that same system. Thus, amino acid supplements may result in impaired or imbalanced amino acid absorption. Furthermore, absorption of peptides (which are obtained from digestion of natural protein-containing foods) is more rapid than absorption of an equivalent mixture of free amino acids. Also, nitrogen assimilation following ingestion of protein-containing foods is superior to that following ingestion of free amino acids. In other words, free amino acids have no absorptive advantage."

    How ‘bout that.

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    No takers? How 'bout that.
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    Interesting... references to studies always helps though.
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    I don't waste money on amino supplements anyway. I like real whole food!. Our bodies were not designer to take pills and liquid supplements all day long. We have been eating real food since the dawn of time!
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    Quote Originally Posted by TheCrownedOne
    Here’s a little protein information for your digestion quoted from "Advanced Nutrition and Human Metabolism", 4th Edition, pg 184:

    "Ingesting free, crystalline L-amino acids is thought by many athletes to be superior to ingesting natural foods containing protein for muscle protein synthesis. However, amino acids using the same carrier system compete with each other for absorption. Thus, ingesting one amino acid or a particular group of amino acids that use the same carrier system may create, depending on the amount ingested, a competition between the amino acids for absorption. The result may be that the amino acid present in the highest concentration is absorbed but also may impair the absorption of the other, less concentrated amino acids carried by that same system. Thus, amino acid supplements may result in impaired or imbalanced amino acid absorption. Furthermore, absorption of peptides (which are obtained from digestion of natural protein-containing foods) is more rapid than absorption of an equivalent mixture of free amino acids. Also, nitrogen assimilation following ingestion of protein-containing foods is superior to that following ingestion of free amino acids. In other words, free amino acids have no absorptive advantage."

    How ‘bout that.
    Good info thanks !
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    I think it just shows us that it is futile to try and create a "perfect protein" through combing free form amino acids. Maybe it also explains why some people say glutamine peptides are better than free form. Still, there is no denying the use of specific, usually non essential, amino acids to enhance training. Examples include tyrosine, taurine, and citrulline. However, we are not ingesting these amino acids to induce protein synthesis on their own, usually they are used to enhance performance and prevent catabolism (maybe even boost protein sythesis when whole proteins are consumed).
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