What is the EXACT reason we are not supposed to eat & drink at the same time?

I'm 5 1/2 months post op and I really should know the answer to this question but I don't. I know that we are not supposed to drink within 30 to 45 minutes of eating. Is this because it will flush out our food too quickly or because it will stretch the pouch or both or something entirely different? I feel silly asking but I'd really like to know the exact reason. Thanks friends!!

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