Can anyone tell me why the pre-op diet differs so much from person to person?

I'm reading many different things on people's posts here. I'm reading some that say that they can eat a normal diet up until the day before the surgery, and then I'm reading that others are told to be on a liquid diet for up to 2 weeks before the surgery. I myself cannot fathom being on a liquid diet PRE-OP with a "normal" sized stomach. I know myself, have done liquid diets before, and feel weak. I know that for the first couple of weeks after the surgery, you're on liquids, but you feel full consuming the liquids. I understand that a surgeon would want someone's digestive system to be clear before this type of surgery, but 2 weeks????

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