What are the differences between Roux-y GB and the Roux-en-y?

My physician said his was the Roux-y GB... The cadillac of them all. Allows you nutrition absorption, a larger band to allow more variety of foods but two meals a day about 1/2 cup each meal. Now if he is taking the intestine and doing the same as the roux-en-y, how come the calories are absorbed in the Gastric banded diversion?

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