Why not soy protein?

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(The Long Run @ May 18 2008,8:25)</div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">4) Soy may have a complete vegetable protein your body can use, but it also had a chemical that keeps your intestines from absorbing that protein.

So there you have it. Eating soybeans or anything from them is USELESS.</div>
Like Ruthenian, I'd also love to learn more about your statement that I quoted. Good references will do, I can read studies by myself.

Regards,
-JV
 
Another note on Soy is it is insufficent in providing all essential amino acids. &quot;Of the 20 standard proteinogenic amino acids, 8 are called essential amino acids because the human body cannot synthesize them from other compounds at the level needed for normal growth, so they must be obtained from food.&quot;[wikipedia]

Protein such as red meat, fish, chicken, milk, etc. provide this 8 essential amino acids. Soy protein only provides 2, so it is incomplete.
 
<div></div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">Soy protein only provides 2, so it is incomplete.</div>

If you look at the amino acid profile of any soy protein powder you will see that you are incorrect.  Soy carries a PDCAAS score of 1.0, meaning that it definitely does provide all the AAs -- this is the reason it is often considered as an alternative protein source.  The issue is whether it carries deleterious compounds as well.
 
Let me rephrase that, soy does have all the aminos but of the 8 essential amino acids Soy Protein is relatively low on amount. Soy is not as low as other beans, etc. but it doesn't have the same dose that animal proteins do.

&quot;Soy protein is mostly incomplete protein as is has a low methionine content like all beans, peas, lentils and nuts. To get complete protein you need all the 8 essential amino acids in the right amounts, so all animal protein is complete protein.

Bread, cereals, muesli and pasta all have a low lysine content but if you combine them with beans, peas, lentils or nuts then you get complete protein. This combining of incomplete proteins to get complete proteins is known as protein complementing.&quot;
 
&quot;Egg has an actual PDCAA score of 1.19 compared to 0.92 for isolated soy protein, however when leveled down, they appear much closer.&quot; [wiki]
 
The primary research focusing on soy protein provides conflicting results. Some of the research indicates possible health benefits with soy protein consumption while some shows minimal to no benefits or detrimental effects.

A recent meta-analysis by Taku and colleagues (2007) evaluated the precise effects of soy isoflavones (group of organic compounds related to flavonoids that act as phytoestrogens in mammals) on lipid profiles. PUBMED was searched for English-language reports of randomized controlled trials published from 1990–2006 that described the effects of soy protein intake in humans. Eleven studies were selected for the meta-analysis. The researchers found that soy isoflavones significantly reduced serum totals and LDL cholesterol but did not change HDL cholesterol and triacylglycerol. Soy protein that contained enriched or depleted isoflavones also significantly improved lipid profiles. Reductions in LDL cholesterol were larger in hypercholesterolemic than in normocholesterolemic subjects.

The following is an excerpt from Girth Control (Aragon 2007):

“According to a recent review from the nutrition committee of the American Heart Association Science advisory, no benefit is evident on HDL cholesterol, triglycerides, lipoprotein (a), or blood pressure. Thus, the direct cardiovascular health benefit of soy protein or isoflavone supplements is minimal at best. Soy protein or isoflavones have not been shown to improve vasomotor symptoms of menopause, and results are mixed with regard to the slowing of postmenopausal bone loss. The efficacy and safety of soy isoflavones for preventing or treating cancer of the breast, endometrium, and prostate are not established; evidence from clinical trials is meager and cautionary with regard to a possible adverse effect. For this reason, use of isoflavone supplements in food or pills is not recommended.”

thanks
Coach Hale
www.maxcondition.com
 
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