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Soy vs Whey Protein supplements

post #1 of 30
5/8/08 at 2:49pm
Thread Starter 
Hello, anyone can answer quickly why whey protein is preferred over soy for protein shakes/meal replacments?
For regular strength exercises and building muscle.
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post #2 of 30
5/8/08 at 3:00pm
Whey is more bioavailable, absorbs more quickly, contains more BCAAs, and doesn't have any questionable estrogenic properties.
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post #3 of 30
5/8/08 at 3:02pm
^ what he said.
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post #4 of 30
5/8/08 at 3:05pm
Thread Starter 
Quote:
Originally Posted by Philosoph View Post
Whey is more bioavailable, absorbs more quickly, contains more BCAAs, and doesn't have any questionable estrogenic properties.

so a theoretical diet consisting of only soy for the protein intake, would mean one is not receiving all essential amino acids? or are there different kinds of soy that hold all combos of the amino acids and that is mixed into the supplements?

is there a report of soy protein mainly used by bodybuilders and such having difficulty growing more muscle due to the estrogenic properties?
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post #5 of 30
5/8/08 at 3:23pm
Yes, what he said.
Quote:
Originally Posted by shoe View Post
so a theoretical diet consisting of only soy for the protein intake, would mean one is not receiving all essential amino acids? or are there different kinds of soy that hold all combos of the amino acids and that is mixed into the supplements? is there a report of soy protein mainly used by bodybuilders and such having difficulty growing more muscle due to the estrogenic properties?
Soy protein is considered by some to be a 'complete' protein because of its high amount of amino acids and bcaa's, but whey is still more efficient in intake and has more bcaa's. This soy { http://www.bodybuilding.com/store/ham/soy.html } is marketed as 'equal' to any animal protein, and while I don't buy that for a second, it is a good option if you are a vegetarian or want to stay away from whey. If you maintain a sound diet and supplement with soy I think you'll be fine.
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post #6 of 30
5/8/08 at 3:25pm
Whaaa..?! I don't know what the exact amino acid makeup of soy is, but an only-soy diet would, without a doubt, cause some major nutrient deficiencies. IIRC, soy is a complete protein, which means it has all the EAAs. But that doesn't mean it has an optimal ratio of them. Whey is a better complete protein. Soy protein supplements are mainly important for vegans or people who have issues with milk products. Most avoid them though, because there are better options which won't make you grow man tits. Yes, the estrogenic potency of soy is debatable, but it's not even a concern with whey. And most lactose issues can be resolved with a good whey isolate. Depending on how serious you are, you could also just drink whole milk.
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post #7 of 30
5/8/08 at 3:30pm
As a guy with a choice between soy and whey, for the above stated reasons, choose whey.
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post #8 of 30
5/8/08 at 3:34pm
Quote:
Originally Posted by Philosoph View Post
Whaaa..?!

I don't know what the exact amino acid makeup of soy is, but an only-soy diet would, without a doubt, cause some major nutrient deficiencies. IIRC, soy is a complete protein, which means it has all the EAAs. But that doesn't mean it has an optimal ratio of them. Whey is a better complete protein.

Soy protein supplements are mainly important for vegans or people who have issues with milk products. Most avoid them though, because there are better options which won't make you grow man tits. Yes, the estrogenic potency of soy is debatable, but it's not even a concern with whey. And most lactose issues can be resolved with a good whey isolate.

Depending on how serious you are, you could also just drink whole milk.

No, I agree. There is a slew of evidence showing that people who decide to stay away from animal proteins in general have nutritional deficiencies.

Also, forgot about whey isolate - although that is assuming his needs stem from lactose intolerance or the like.
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post #9 of 30
5/8/08 at 3:41pm
^ I know, I was responding to shoe's post and didn't quote.
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post #10 of 30
5/8/08 at 3:55pm
Thread Starter 
Quote:
Originally Posted by Philosoph View Post
Whaaa..?!

I don't know what the exact amino acid makeup of soy is, but an only-soy diet would, without a doubt, cause some major nutrient deficiencies. IIRC, soy is a complete protein, which means it has all the EAAs.

yes i agree, but what i stated was a diet that consists of only soy, for the protein intake .
meaning i eat everything in a balanced diet, but soy as my only source of protein in that diet. not just soy protein for diet per se. not what i meant
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post #11 of 30
5/8/08 at 3:57pm
Quote:
Originally Posted by shoe View Post
yes i agree, but what i stated was a diet that consists of only soy, for the protein intake .
meaning i eat everything in a balanced diet, but soy as my only source of protein in that diet. not just soy protein for diet per se. not what i meant

Why would you do that?
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post #12 of 30
5/8/08 at 4:05pm
Quote:
Originally Posted by shoe View Post
yes i agree, but what i stated was a diet that consists of only soy, for the protein intake .
meaning i eat everything in a balanced diet, but soy as my only source of protein in that diet. not just soy protein for diet per se. not what i meant

Ok... it's still a dumb idea. I don't mean to insult your intelligence... but do you have a good reason to do such a thing?
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post #13 of 30
5/8/08 at 4:51pm
Thread Starter 
i am stating that as a theoretical. like for argument's sake. just to distill out what the advantage of whey over soy is that was it.
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post #14 of 30
5/8/08 at 4:56pm
I personally choose whey over soy. The BCAA's are important especially for strength and muscle building. I also supplement with a bit of casein post-workout and sometimes before I sleep just to keep my body in a anabolic state.
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post #15 of 30
5/8/08 at 8:47pm
http://www.bodybuilding.com/fun/tietge7.htm The legit studies referenced in the article, the article just tried to sum them up. Background explanation before I go further: Weight training increases your daily protein requirement. As a general rule, you should have 1 gram of protein per pound of bodyweight per day. However, be careful of having too much protein, because it can be converted to fat and stored in adipose tissue. In addition, diversity on your sources of protein is important in order get a complete essential amino acid profile. Proteins can be classified according to their Biological Value (BV), which measures how easily a protein source is assimilated and utilized by the body. The higher the number ranking, the quicker the protein is absorbed but also the faster it's rendered useless within the body. http://www.dynamicbodies.com/protein.htm Look a couple paragraphs down for the BV index. Notice that whey has more than twice the Biological Value than soy (159 Whey vs. 69 Soy). My take is unless your vegan I would look at whey over soy. Soy has as a lot of other side things tied to it that aren't so desirable. Not only that whey is a more complete protien, that is utilized by the body in a quicker manner. Not to mention whey is cheaper, and easier to get into your diet. Egg and caesin and other protiens are also better sources than soy. A better method to look at this, is how can I BALANCE my protein intake in my diet and get it from a variety of sources.
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