why is drinking not OK BEFORE meals?

I understand why drinking is not allowed after a meal as it would push your food straight into your intestines, but why not after? From what I understand, liguid moves through a pouch in less than 5 minutes. Why can I sip water before a meal out when everyone else is getting their drinks, and then take a pause at the begining of the meal? Thanks - just trying to get all of those questions in pre-op.

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