Genetics, maybe if we chewed on sick all day we would get as strong, they process things a bit differently.

Actually animals are the most effecient source of ptotein to build muscle, not only good sources.

Apperently by trying to let the author know that the 2 protein sources are not equal the thread has went a bit off track
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"In the beginers mind there are many possibilities, but in the expert's there are few."
Shunryu Suzuki