What's the difference in soy protein and whey.

MelStren

Just made it home with a new brand of protein powder when I noticed that it's Soy protein and not whey. What's the difference?

Tatiyanya

whey comes from milk, soy comes from ..well..soybeans. So as vegan, go with soya."Whey protein contains more amino acids than soy protein concentrate and is used slightly more efficiently by the body." Dont think there is major difference tho, i prefere the taste and general feel of whey protein but soy is aparently good too

lucasriggs

Soya protein is made from soya beans, where as whey is made from milk.
Whey has also been shown to absorb faster into the body than soya.

KarenJanine

Both are 'complete proteins' meaning that they contain all essential amino acids (those which cannot be synthesised by the body) so they will both do a similar job.

felice03

Soy tears up my stomach, whey does not. That is the only difference I can share.

Arkhos

It is believed that Soy produces estrogen and lowers testosterone which has a negative impact on gaining muscle (especially for men).

Overall Whey Protein has the greater impact:

Soy vs. Whey Protein
Tie
Variable/Criteria Soy Protein Whey Protein Better Protein
Biological Value (BV) 74 104 Whey Protein
Net Protein Utilization (NPU) 61 92 Whey Protein
Protein Efficiency Ration (PER) 2.2 3.2 Whey Protein
Amino Acid Score (AAS) 0.99 1.14 Whey Protein
Protein Digestibility Corrected Amino Acid Score (PDCAAS) 1.00 1.00
Protein Digestibility Percentage (PD%) 95% 99% Whey Protein
Glutamine per 100g of Protein 10.5g 4.9g Soy Protein
mg EAA per g of Protein 378mg 480mg Whey Protein
Arginine per 100g of Protein 7.6g 2.9g Soy Protein


http://www.mytopform.com/whey-protein-vs-soy-protein