soy protein vs other sources
If I had my choice....... soy would be the last protein chosen to build my body with. I do not believe that soy is bad, only that others are better.
I agree with Stew that soy's taste is not always agreeable, but I would eat darn near anyrthing if I though it was truely good for me and could not get the benefits any other way. I have a choice over soy.
Many many folks of northern european decent are allergic to soy. This not only lowers the immune system and hinders recovery, but can be irritating as heck. Sometimes we cannot even tell we are allergic to soy but the problem is there enough to compromise us a bit.
If you choose to use soy and have the possibilty of an allergy to it, get tested and find out...simple to do.
Finally, amino acid profiling has shown that the most easily assimilated proteins are as follows in order of recommendation. Non fat cottage cheese, white turkey breast, fish like tuna and halibut...then chicken breast (skinless), and then red meat. Red meat was last only because of the amounts of saturated fat in them. Their profiles were desirable. Egg whites are good but harder to digest. (only 80% is assimilated).
What this means is that caseine is numero uno (#1), then whey....... soy is not as desirable in my reading. I am sure there are studies that have different conclusions. Just sharing my views on the subject.