Scary thought about "Soy Milk"

[Narkissos]

^^Soy is complete.

It's methionine and cysteine amounts are lower.

This does not alter its complete status.

-CNS

[Dezeroth]

^^Soy is complete.

It's methionine and cysteine amounts are lower.

This does not alter its complete status.

-CNS

great reply, thanks!

[naturalsux]

i ve been drinking a couple gallons of chocolate soy milk every week for probably almost a year. without any problems.

[C_Bino]

^^Soy is complete.

It's methionine and cysteine amounts are lower.

This does not alter its complete status.

-CNS

Right on, soy is definitely complete just sulfur based amino's are lower. BUT I will say that biological value of soy is lower compared with cow milk.

Nark do you know the value for soy...84 or something?

Also I have supplemented with soy protein. When they make soy isolate they take out the inherent protease inhibitors and even add more methionine sometimes. Perfectly good protein source to use.

But I also like to get my milk from Webb's utters.

[Narkissos]

Right on, soy is definitely complete just sulfur based amino's are lower. BUT I will say that biological value of soy is lower compared with cow milk.

Nark do you know the value for soy...84 or something?

Lower than cow's milk.. but not 'low'

I forgot to include these arguments in my last article... but i may include them in my following article(s) (or the re-release of this article).

Soy proteins of times past have been cheap gunk...no getting around that.

Protein powders period have come a long way.

According to the Benamouzig et. al. study of 1999 however, soy's bioavailability is 92% that of milk protein.[1]

Which basically charts it as lower.. but far from 'low'.

Something else associated with soy protein is claims of poor assimilation.

In this study however:

Oro-ileal digestibility of SPI nitrogen was 91%. The amount of absorbed SPI amino acids used for nonoxidative disposal, i.e., postprandial biological value, was 86% 8 h after meal ingestion. Hence, net postprandial protein utilization of SPI was 78%. Compared to previous data that were assessed under the same condition in humans, the nutritional value of SPI is 92% of that in milk protein concentrate.

Thus, i do not believe digestibility is an issue.

I myself get less issues with soy than i get with whey...

This applies even to whey deemed 'lactose-free'.

-CNS



References:

1. Benamouzig et. al. Nutritional Value of [15N]-Soy Protein Isolate Assessed from Ileal Digestibility and Postprandial Protein Utilization in Humans. Journal of Nutrition. 1999;129:1992-1997.

[Coop77]

^^Soy is complete.

It's methionine and cysteine amounts are lower.

This does not alter its complete status.

-CNS

This is data I found on some webpage. Maybe the difference is insignificant, but whey seems to have a better profile.

Amino Acid Soy Protein Whey Protein
Isoleucine (BCAA) 49mg 54mg
Leucine (BCAA) 82mg 89mg
Valine (BCAA) 48mg 82mg
Histidine 19mg 16mg
Lysine 64mg 88mg
Methionine 26mg 32mg
Phenylalanine 38mg 32mg
Threonine 38mg 65mg
Tryptophan 14mg 22mg
Totals 378mg 480mg

[Narkissos]

This is data I found on some webpage. Maybe the difference is insignificant, but whey seems to have a better profile.

Amino Acid Soy Protein Whey Protein
Isoleucine (BCAA) 49mg 54mg
Leucine (BCAA) 82mg 89mg
Valine (BCAA) 48mg 82mg
Histidine 19mg 16mg
Lysine 64mg 88mg
Methionine 26mg 32mg
Phenylalanine 38mg 32mg
Threonine 38mg 65mg
Tryptophan 14mg 22mg
Totals 378mg 480mg

I'll go one up for you there:





Insignificant really.

Especially seeing that you won't be using either as your sole protein source.

-CNS


References:

Misner, W.D., The Great Hammer Protein Debate: Which Protein Is The Best, How Much And When? THE JOURNAL OF ENDURANCE:2001:#8.

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