***Pure Soy Protein Isolate vs Whey Protein Isolate

  • Posted by a hidden member.
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    Oct 29, 2013 3:42 PM GMT
    ***Pure Soy Protein Isolate vs Whey Protein Isolate
    hello

    what I know is that Whey Protein Isolate is rapidly digested, so its good to be taken before or after workouts.

    is Pure Soy Protein Isolate is rapid or slow digested?
    taking Pure Soy Protein Isolate after workouts can bring good results?

    this is the full description , thanks


    Ingredients

    Pure Soy Protein Isolate



    Soy protein, often used as an alternative to meat-based protein, is rich in nutrients that are vital for bodily health and function. It is included in many food products, as well as nutritional supplements targeted toward enhancing physical performance. Depending on what form you consume it in, it also may contribute to preventing disease.

    Pure Source Nutrition Soy protein isolate is a pure form of soy protein that is refined from soy flour through alkali extraction, extraction of fiber and drying. Almost completely less in carbohydrates and fats, it contains approximately 90 percent protein. It has a neutral flavor and, because of bacterial fermentation, is less likely to cause flatulence than other forms of soy protein.



    Features

    Pure Soy Isolate
    Free from any animal products
    Low in fat + carbohydrate
    No additives, sweeteners or flavours
    Free from genetically modified materials
    A source of high quality vegetable protein
    With Vitamins & Minerals
  • MikeW

    Posts: 6061

    Oct 29, 2013 5:09 PM GMT
    1: Google: "soy vs whey protein" You'll see lots of articles

    Example:

    Whey protein is:
    A protein found in milk
    Fast-absorbing
    In your body for a shorter time
    A good supplement after intense workouts

    Casein protein is:
    The main protein in milk
    Slow-absorbing
    In your body for a longer time
    A good supplement for meal replacements or to take before bed

    Soy protein is:
    A plant-based source of protein (i.e., perfect for vegans)
    As digestible as other sources of protein
    Known for its antioxidant capabilities
    A good supplement for meal replacements

    2: I don't know how fast it digests but assume it is somewhere in-between whey and casein.

    3: Some believe soy negatively effects testosterone levels (or, rather, increases estrogen) in male athletes. The scientific studies are inconclusive and thus a source of debate.
  • Posted by a hidden member.
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    Oct 29, 2013 6:15 PM GMT
    thanks


    so a shake containing 20% whey and 80% casein is not a good one for after workouts?
  • cowboyathlete

    Posts: 1346

    Oct 29, 2013 6:17 PM GMT
    fantasticlad saidthanks


    so a shake containing 20% whey and 80% casein is not a good one for after workouts?
    I use one that is a mixture of whey and casein. The whey gets taken up rapidly, whereas the casein gives a steadier supply of protein.
  • Posted by a hidden member.
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    Oct 29, 2013 7:57 PM GMT
    Soy protein is so bad for men! Soy increases estrogen protection and decreased testostorne in men! So I use 100% whey protein!
  • tuffguyndc

    Posts: 4437

    Oct 29, 2013 8:45 PM GMT
    Lee1368 saidSoy protein is so bad for men! Soy increases estrogen protection and decreased testostorne in men! So I use 100% whey protein!
    what he said and of course they will always say there isn't proven real data because they are trying to sell a product. however, all you have to do is talk to a physician or read the consumer reports about the products on consumer.com that stuff is not good for guys. if you do not mind man boobs than i say go ahead and use soy. if you do mind than you should stay away from it. they also make protein that is made from eggs or meat. why don't you try one of those
  • Posted by a hidden member.
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    Oct 30, 2013 4:55 AM GMT
    Soy is nearly as fast as whey last I checked. It increases amino acid levels in the blood for a longer period of time too because it is slightly slower than whey.

    As for soy and testosterone, there was a study that came out April 2013 that shows that yes, in these artificial experimental conditions you are welcome to read about if you follow the link below (and don't just read the abstract please) soy does minorly impact testosterone levels acutely in nonvegetarian men (ie people who are not regularly consuming it). As with anything physiological, negative feedback mechanisms come into play. There is a reason they did not test it in vegetarian and vegan men because they know they would not find an acute effect because they regularly consume it and their body compensates by changing receptors and/or hormone production levels. There is also a reason why people consuming a high protein diet, even vegetarians, would likely not experience the decline (because gram for gram equivalent of soy protein is not as effective gram for gram as whey, you have to eat more of it...) "Vegetarians, vegans, or subjects who consumed
    high-protein diets were excluded from the study"
    http://hoffday.files.wordpress.com/2013/09/jacn-soy-whey-testosterone-acute-exercise-in-men-2013.pdf


    Long term studies pretty much show it is harmless, if not a functional food that could possibly decrease risk of prostate cancer and heart disease due to lack of saturated fat and the isoflavones.

    Furthermore, if you are concerned about phytoestrogens, why are you concerned about soy and not flaxseed, which has way more of them. Why aren't you concerned with oats and beans? There are a list of foods you regularly eat that people consider "clean" and soy gets all the bad press. Check out the phytoestrogen link below to see that list of foods ;)

    http://en.wikipedia.org/wiki/Phytoestrogens#Males

    Hope that clears it up for everyone.