Why are we not to drink 30 minutes before eating?

I'm 8 weeks out with 38 lbs gone forever! But, I can't seem to make sense of the no drinking before meals. I was told that my stomach was like a bucket with a small hole in the bottom. If this is true wouldn't all the liquid be gone if I were to eat 5 or 10 minutes later? I only take sips so it's not like I'm overloading on liquids anyway. Please help me understand, thanks!

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