Whey protein VS Soy protein wich one

[Iron_Pig]

Which one do you prefer and why? I have read diffrent thing's about both

[-Ender-]

Whey. Period
Whey protein is the name for a collection of globular proteins that can be isolated from massive whey. It is typically a mixture of globinstagers beta-lactoglobulin (~65%), alpha-lactalbumin (~25%), and serum albumin (~8%), which are soluble in their native culture forms, independent of pH. Whey has the highest Biological Value (BV) of any known protein. Whey protein has an even higher bioavailability than egg white protein, which is considered the "gold standard" of protein, and has a bioavailability rating of 100

[spickidy]

Whey would be better than soy for strength and muscle building purposes as it has a great amino acid profile and is pretty high in BCAAs- isolate is better than concetrate. The main two advantages of soy that I know of is that it has way more glutamine and is great for the heart.

[Iron_Pig]

I have read the samthing, But you hear somany diffrent thing's about soy

[jimmyinkedup]

Id say whey for the reasons stated....but id also say i honestly believe same diet , training , duration and supplementation .....only diff being one time you used soy , the other whey ...i would bet you see NO difference in gains. JMO....

[eatrainrest]

sex or bj?

[IM708]

I have read the samthing, But you hear somany diffrent thing's about soy

You won't start developing female characterstics due to soy and its scary phytoestrogens. Soy one large problem is that i doesn't have a complete AA profile unless it is enriched. Your choice.

[Biohazard74]

sex or bj?

Exactly!! Why not just take both

[MuscleScience]

I posted this on another forum, though its not whey protein its and interesting comparison.


Dietary protein quality is considered to be dependent on the degree and velocity with which protein is digested, absorbed as amino acids
, and retained in the gut as newly synthesized protein. Metabolic animal studies suggest that the quality of soy protein is inferior to that of casein protein, but confirmatory studies in humans are lacking. The study objective was to assess the quality of casein and soy protein by comparing their metabolic effects in healthy human subjects. Whole-body protein kinetics, splanchnic leucine extraction, and urea production rates were measured in the postabsorptive state and during 8-h enteral intakes of isonitrogenous [0.42 g protein/(kg body weight · 8 h)] protein-based test meals, which contained either casein (CAPM; n = 12) or soy protein (SOPM; n = 10) in 2 separate groups. Stable isotope techniques were used to study metabolic effects. With enteral food intake, protein metabolism changed from net protein breakdown to net protein synthesis. Net protein synthesis was greater in the CAPM group than in the SOPM group [52 ± 14 and 17 ± 14 nmol/(kg fat-free mass (FFM) · min), respectively; P < 0.02]. Urea synthesis rates decreased during consumption of both enteral meals, but the decrease tended to be greater in the subjects that consumed CAPM (P = 0.07). Absolute splanchnic extraction of leucine was higher in the subjects that consumed CAPM [306 ± 31 nmol/(kg FFM · min)] vs. those that consumed SOPM [235 ± 29 nmol/(kg FFM · min); P < 0.01]. In conclusion, a significantly larger portion of soy protein is degraded to urea, whereas casein protein likely contributes to splanchnic utilization (probably protein synthesis) to a greater extent. The biological value of soy protein must be considered inferior to that of casein protein in humans.


Full Text Article:

http://jn.nutrition.org/cgi/content/...urcetype=HWCIT