Soy Protein Isolate

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  1. #1
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    Soy Protein Isolate






    Anyone else taking Honeyville Soy Protein Isolate? A 4lb bag has 24g of protein per oz. Has anyone had personal experience with Soy Protein Isolate?

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    I can tell you that soy is def not optimal due to the amino acid profile. Whey is far better

    www.steroidsfax.com

    EvolutionPeptides.com Discount Code: EOD15 15% Off

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    Why not take the money you would spend on soy and buy some real food. Like beef. It has a superior amino acid profile and ZINC which you may be deficient in. Good luck.

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    I think its pretty decent.

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    Quote Originally Posted by OldSkool View Post
    Why not take the money you would spend on soy and buy some real food. Like beef. It has a superior amino acid profile and ZINC which you may be deficient in. Good luck.
    I plan on eating both, but was interested supplementing a small portion (about 1/4 to 1/3) of my daily protein needs. Soy protein seems to be the least expensive and very affordable. It would be 1,555 grams of protein for $24.

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    I'm surprised that no one else has any experience with using soy protein...

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    Soy protein is cheap because its awful. Its also not a particularly good choice for males. Its a phyto-estrogen. Just do some research. Beef, chicken, fish, and eggs are great and supplement with whey or a whey egg protein blend. All of those give more bang for the buck than soy and taste better.

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    Everything I've read places soy protein on the bottom end of protein choices. There are several better sources as many listed above.

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    Quote Originally Posted by akadon View Post
    I'm surprised that no one else has any experience with using soy protein...
    I avoid all soy. I wrecks testosterone.
    Everything I type is intended as humor, entertainment, or research.

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    Collagen protein. Thank me later.
    TheCaptn' is not a registered proctologist. His post are for his amusement only. Please seek proper medical advice if symptoms persist.


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    Soy protein = bitch tits

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    Quote Originally Posted by Uplifted View Post
    Soy protein = bitch tits
    protein is protein just like a calorie is a calorie no matter it's source correct?

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    No
    ABAXEN PHARMACEUTICALS
    FASTEST T/A TIME, HIGHEST QUALITY GEAR AND BEST CUSTOMER SERVICE
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    Quote Originally Posted by akadon View Post
    protein is protein just like a calorie is a calorie no matter it's source correct?
    No. Aside from the poor amino acid profile, soy contains trypsin inhibitors which block protein degrading enzymes. If you don;t fully digest protein, you don't absorb it. There was a study a while back that showed eating soy even lowers the bioavailability of other protein sources you consume with it because they don't get broken down.

    Here's a good rundown from John Kiefer on soy.

    http://articles.elitefts.com/nutriti...rotein-killer/
    If sense were common, everyone would have it.

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    Quote Originally Posted by exerciseordie View Post
    I can tell you that soy is def not optimal due to the amino acid profile. Whey is far better
    Not True

    Soy is higher in...

    1) Glutamine

    2) Branch Chain Amino Acids (Leucine/Isoluecine/Valine

    3) Argenine

    Kenny Croxdale

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    Quote Originally Posted by flood View Post
    I avoid all soy. I wrecks testosterone.
    Misconception

    Like you, I've heard this forever and never used it.

    However, the research indicates that isn't true.

    Whey vs. Soy -- You've Been Tricked
    http://www.timinvermont.com/fitness/soyvswhy.htm

    "Animal research suggests some great advantages of using soy protein isolate as a bodybuilding supplement. Research has shown that the isoflavone daidzein found in soy-protein isolate might have a gender specific normalizing effect on sex-hormone production. Lab animals experienced testosterone and growth hormone excretion as well as muscle growth in males, while the female animals experienced a decrease in these hormones and fat loss."

    Soy Vs. Whey

    "The latest studies into soy protein suggest it does not decrease testosterone and raise estrogen, as previously thought."

    "... the American College of Sports Medicine (ACSM) Meeting, May 2004, and sponsored by the US National Dairy Council, found the post-workout consumption of isonitrogenous and isoenergetic soy drink to be statistically significant in hastening mass, fat-bone free mass (FBFM) and increases in strength..."

    Soy's Amino Acid Profile

    1) Soy is higher in Arginine than Whey.

    2) Soy is higher in Glutamine than Whey

    "Arginine is well known as a stimulant of anabolic hormones that stimulate muscle formation, while glutamine is considered essential during metabolic stress."http://www.bodybuilding.com/fun/drobson71.htm

    Synergistic Protein Stack

    Synergistic: The sum is greater than the individual parts.

    Synergistic Example: 2 + 2 = 5

    What research shows is that combining two proteins with different amino acid profiles, magnifies the effetiveness.

    "Used together in an exercise regimen, soy and whey proteins complement each other well. Whey protein, as mentioned, is high in branched chain amino acids, used as an important energy source by the body during exercise, while soy protein has high amounts of the amino acids arginine and glutamine."

    Another Look

    The best thing to do is review the information posted above, do your own research and come to you own conclusions.

    As for me, Soy Isolate appears to have some definite strength. Even better is the low cost of it.

    Kenny Croxdale

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    Who knows what's true or not. Eat more meat I say.
    TheCaptn' is not a registered proctologist. His post are for his amusement only. Please seek proper medical advice if symptoms persist.


  18. #18
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    Quote Originally Posted by Dale Mabry View Post
    No. Aside from the poor amino acid profile, soy contains trypsin inhibitors which block protein degrading enzymes. If you don;t fully digest protein, you don't absorb it. There was a study a while back that showed eating soy even lowers the bioavailability of other protein sources you consume with it because they don't get broken down.

    Here's a good rundown from John Kiefer on soy.

    http://articles.elitefts.com/nutriti...rotein-killer/
    Thanks for bringing "trypsin" to my attention. From what I just read, when soy is fermented or heat treated, trypsin levels become severely depleted. Soy protein isolate is heat treated I believe.

  19. #19
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    Quote Originally Posted by akadon View Post
    Thanks for bringing "trypsin" to my attention. From what I just read, when soy is fermented or heat treated, trypsin levels become severely depleted. Soy protein isolate is heat treated I believe.
    It should be heat treated, not sure for how long though and it may vary by manufacturer. My concern would be in relying on SPI as the primary source of protein. You will remove 80-90% of the TIAs from heating it properly but having 3-4 servigns a day could impact protein digestibility significantly. I wouldn't worry about this so much from a gains perspective because most BBers overeat protein anyway. What I would be concerned with is fucking up your gut bacteria. You aren't supposed to have large amounts of undigested protein in your colon. This is the problem with gluten, we don't digest it very well and it can fuck up your microbiota. This is also why gluten and legumes such as soy and peanuts tend to be immunogenic, 80% of your immune system is housed in your gut.
    If sense were common, everyone would have it.

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    Quote Originally Posted by Dale Mabry View Post
    It should be heat treated, not sure for how long though and it may vary by manufacturer. My concern would be in relying on SPI as the primary source of protein. You will remove 80-90% of the TIAs from heating it properly but having 3-4 servigns a day could impact protein digestibility significantly. I wouldn't worry about this so much from a gains perspective because most BBers overeat protein anyway. What I would be concerned with is fucking up your gut bacteria. You aren't supposed to have large amounts of undigested protein in your colon. This is the problem with gluten, we don't digest it very well and it can fuck up your microbiota. This is also why gluten and legumes such as soy and peanuts tend to be immunogenic, 80% of your immune system is housed in your gut.
    Yea, I've been doing a lot of reading, and just read about soy containing phytates which affects the gastrointestinal tract. While I believe that the estrogen effects on humans is bull and that most of soy's anti-nutrients are dropped to a safe level during fermentation, I'm not sure and decided not to risk taking SPI as I do not know and can not be 100% sure what's left in it or how it was prepaid.

  21. #21
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    You don't really need to worry about phytates because they do not bind minerals, they are already bound to them in whatever you are eating. I agree the estrogenic effect is likely overstated, my primary concern with soy is that we don't break it down very well. Now, if it's hydrolyzed, it doesn't really concern me as much.
    If sense were common, everyone would have it.

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    Quote Originally Posted by Dale Mabry View Post
    You don't really need to worry about phytates because they do not bind minerals, they are already bound to them in whatever you are eating. I agree the estrogenic effect is likely overstated, my primary concern with soy is that we don't break it down very well. Now, if it's hydrolyzed, it doesn't really concern me as much.


    I just decided to buy 10 lbs of Whey protein. It cost A LOT more than I can really afford on a regular basis, but there are too many unknowns when it comes to buying soy. I can't be to sure what's in it and how certain brands prepared it. Thanks for all the useful info.

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    Whey is pretty good and fast absorbing. I used to be more about blends, but I don't eat casein anymore so the only blend I would use is whey/egg. Although, at this point I get all of my protein from food.
    If sense were common, everyone would have it.

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    Whey concentrate has all the nutrients in it still.
    TheCaptn' is not a registered proctologist. His post are for his amusement only. Please seek proper medical advice if symptoms persist.


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    Quote Originally Posted by Dale Mabry View Post
    Whey is pretty good and fast absorbing. I used to be more about blends, but I don't eat casein anymore so the only blend I would use is whey/egg. Although, at this point I get all of my protein from food.
    Me too, love the grass fed ribeye. Since raising my fats a lot and dropping carbs WAY down - I max out protein and don't need the powder anymore. I didn't know soy had little effect on protein. Is this study from 2013 flawed? The effects of soy and whey protein supplementation on acute hormonal reponses to resistance exercise in men "CONCLUSION:

    Our main findings demonstrate that 14 days of supplementation with soy protein does appear to partially blunt serum testosterone. In addition, whey influences the response of cortisol following an acute bout of resistance exercise by blunting its increase during recovery. Protein supplementation alters the physiological responses to a commonly used exercise modality with some differences due to the type of protein utilized." http://www.ncbi.nlm.nih.gov/pubmed/24015701
    Last edited by flood; 04-20-2014 at 10:45 PM. Reason: add link
    Everything I type is intended as humor, entertainment, or research.

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    Quote Originally Posted by theCaptn' View Post
    Collagen protein. Thank me later.
    That's a great tip. Youtheory makes a collagen protein powder that would have saved me mixing collagen into my shakes separately. Neocell collagen 1&3 was $9 alone.
    Everything I type is intended as humor, entertainment, or research.

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