Soy Protein vs. Whey Protein??

[Synchronizity]

Okay, I am doing the programs, 13 Weeks to Fat Loss the workout and diet.

I had some Soy Protein and have just purchased some Whey Protein. I haven't read anything about the difference between the two. I know that most everyone here uses it and therefore, assume it is the better product of the two. I, also, noticed that the Whey has less carbs and calories in it. Besides, those two differences what is the real reason for choosing whey over soy? And when throughout the day could I use the soy to finish out my canister (I can't stand letting anything go to waste...).

Thanks for the help! /forum/images/graemlins/smile.gif

[CheezitMan22]

whey absorbs faster. and i think its higher quality, im pretty sure anyway.

[ZachE84]

BV Scale:

Whey is about 109.
Soy is around 74, or much less, depending.

If you don't know what the BV scale is, read this: http://www.bodybuildingpro.com/proteinrating.html

To read more on soy read this: http://www.teenbodybuilding.com/todd12.htm

[Adam Knowlden]

Humans can synthesize only about 50% of the necessary amino acids that make up the proteins in our bodies.

Therefore, if the remaining amino acids (called indispensable or essential) are not consumed in sufficient quantities, protein production is affected adversely. The quality of protein in a food is determined by its indispensable amino acid content.

Some foods contain all of these indispensable amino acids and in amounts sufficient to maintain protein synthesis, while others are lacking in at least one amino acid. The former are called complete protein foods and include such foods as dairy products, eggs, meat and fish, while the latter include grains, vegetables and fruits.

Moreover, it has been shown, at least in 59 to 69 year-old men, that strength training produced greater muscle mass gains with a meat-containing diet in comparison to a lactovegetarian diet.

Campbell WW, Barton Jr ML, Cyr-Campbell D, Davey SL, Beard JL, Parise G, Evans WJ: Effects of an omnivorous diet compared with a lactoovovegetarian diet on resistance-training-induced changes in body composition and skeletal muscle in older men. Am J Clin Nutr 70: 1032–1039, 1999.[

These data suggest that type of protein may play an important role in muscle growth with strength training.

Whey protein, especially whey protein isolates or hydrolyzed whey peptides, is widely promoted to strength athletes as being perhaps the best protein based on its high bioavailability and its content of several critical amino acids, i.e., glutamine, leucine, isoleucine and valine.

Due to differing physiochemical properties, whey protein amino acids enter the blood stream following ingestion faster than casein (major milk protein), which produces a significantly lower but more prolonged increase in blood amino acids.

Boirie Y, Dandin M, Gachon P, Vasson M-P, Maubois J-L, Beaufrère B: Slow and fast dietary protein differently modulate postprandial protein accretion. Proc Nat Acad Sci 94: 14930–14935, 1997

It is clear that carbohydrate intake immediately following glycogen-depleting exercise can enhance subsequent muscle glycogen resynthesis when compared to the same intake several hours later.

Ivy JL, Katz AL, Culter CL, Sherman WM, Coyle EF: Muscle glycogen synthesis after exercise: effect of time of carbohydrate ingestion. J Appl Physiol 64: 1480–1485, 1988

Furthermore, stimulating muscle growth (by minimizing degradation and/or maximizing synthesis) via carbohydrate and amino acid ingestion following a strength exercise session. This is due to insulin-stimulated changes in muscle amino acid uptake and protein synthesis.

Roy BD, Tarnopolsky MA, MacDougall JD, Fowles J, Yarasheski KE: Effect of glucose supplement timing on protein metabolism after resistance training. J Appl Physiol 82: 1882–1888, 1997.

Tipton KD, Ferrando AA, Phillips SM: Postexercise net protein synthesis in human muscle from orally administered amino acids. Am J Physiol 276: E628–E634, 1999

Rasmussen BB, Tipton KD, Miller SL, Wolf SE, Wolfe RR: An oral essential amino acid-carbohydrate supplement enhances muscle protein anabolism after resistance exercise. J Appl Physiol 88: 386–392, 2000.

Farrell PA, Fedele MJ, Vary TC, Kimble SR, Jefferson LS: Effects of intensity of acute-resistance exercise on rates of protein synthesis in moderately diabetic rats. J Appl Physiol 85: 2291–2297, 1998.

MacDougall JD, Gibala MJ, Tarnopolosky MA, MacDonald JR, Interisano SA, Yarasheski KE: The time course of elevated muscle protein synthesis following heavy resistance exercise. Can J Appl Physiol 20: 480–486, 1995

[GodsGladiator]

[ QUOTE ]
Humans can synthesize only about 50% of the necessary amino acids that make up the proteins in our bodies.

Therefore, if the remaining amino acids (called indispensable or essential) are not consumed in sufficient quantities, protein production is affected adversely. The quality of protein in a food is determined by its indispensable amino acid content.

Some foods contain all of these indispensable amino acids and in amounts sufficient to maintain protein synthesis, while others are lacking in at least one amino acid. The former are called complete protein foods and include such foods as dairy products, eggs, meat and fish, while the latter include grains, vegetables and fruits.

Moreover, it has been shown, at least in 59 to 69 year-old men, that strength training produced greater muscle mass gains with a meat-containing diet in comparison to a lactovegetarian diet.

Campbell WW, Barton Jr ML, Cyr-Campbell D, Davey SL, Beard JL, Parise G, Evans WJ: Effects of an omnivorous diet compared with a lactoovovegetarian diet on resistance-training-induced changes in body composition and skeletal muscle in older men. Am J Clin Nutr 70: 1032–1039, 1999.[

These data suggest that type of protein may play an important role in muscle growth with strength training.

Whey protein, especially whey protein isolates or hydrolyzed whey peptides, is widely promoted to strength athletes as being perhaps the best protein based on its high bioavailability and its content of several critical amino acids, i.e., glutamine, leucine, isoleucine and valine.

Due to differing physiochemical properties, whey protein amino acids enter the blood stream following ingestion faster than casein (major milk protein), which produces a significantly lower but more prolonged increase in blood amino acids.

Boirie Y, Dandin M, Gachon P, Vasson M-P, Maubois J-L, Beaufrère B: Slow and fast dietary protein differently modulate postprandial protein accretion. Proc Nat Acad Sci 94: 14930–14935, 1997

It is clear that carbohydrate intake immediately following glycogen-depleting exercise can enhance subsequent muscle glycogen resynthesis when compared to the same intake several hours later.

Ivy JL, Katz AL, Culter CL, Sherman WM, Coyle EF: Muscle glycogen synthesis after exercise: effect of time of carbohydrate ingestion. J Appl Physiol 64: 1480–1485, 1988

Furthermore, stimulating muscle growth (by minimizing degradation and/or maximizing synthesis) via carbohydrate and amino acid ingestion following a strength exercise session. This is due to insulin-stimulated changes in muscle amino acid uptake and protein synthesis.

Roy BD, Tarnopolsky MA, MacDougall JD, Fowles J, Yarasheski KE: Effect of glucose supplement timing on protein metabolism after resistance training. J Appl Physiol 82: 1882–1888, 1997.

Tipton KD, Ferrando AA, Phillips SM: Postexercise net protein synthesis in human muscle from orally administered amino acids. Am J Physiol 276: E628–E634, 1999

Rasmussen BB, Tipton KD, Miller SL, Wolf SE, Wolfe RR: An oral essential amino acid-carbohydrate supplement enhances muscle protein anabolism after resistance exercise. J Appl Physiol 88: 386–392, 2000.

Farrell PA, Fedele MJ, Vary TC, Kimble SR, Jefferson LS: Effects of intensity of acute-resistance exercise on rates of protein synthesis in moderately diabetic rats. J Appl Physiol 85: 2291–2297, 1998.

MacDougall JD, Gibala MJ, Tarnopolosky MA, MacDonald JR, Interisano SA, Yarasheski KE: The time course of elevated muscle protein synthesis following heavy resistance exercise. Can J Appl Physiol 20: 480–486, 1995



[/ QUOTE ]

all in a nut shell hehe

[Synchronizity]

Thanks everyone for the great info and lessons /forum/images/graemlins/smile.gif! I am now prepared to explain a little better why I must purchase the more expensive Proteins (to my mom). Thanks OS for the in-depth explanation it helped me better understand the PWO process.

[Adam Knowlden]

No problem! And go ahead and use the soy until it's gone. Just avoid it post workout. Once it runs out stick with Whey for the most part. Caesin is good for pre-sleep, as it digest slower.

[alanlws16]

[ QUOTE ]
No problem! And go ahead and use the soy until it's gone. Just avoid it post workout. Once it runs out stick with Whey for the most part. Caesin is good for pre-sleep, as it digest slower.

[/ QUOTE ]

Didn't you mention in an article that soy was good for activating the thyroid gland on a cut? How does that work?