When laproscopic gastric bypass is performed, what happens

When laproscopic gastric bypass is performed, what happens to the acid in the portion of the stomach that is bypassed? If it is directed into the lower intestin (without the aid of any food to dilute it) it would eventually rot away the intestinal lining. If it is kept in the unused "pouch" of the stomach, it would eat away at the unused portion of the stomach. What is the longest anyone who has had a gastric bypass has lived??? Please, if anyone has any info, or any links, let me know. I have yet to find a doctor that can answer the first question.

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