VERY CONFUSED PROTEIN DRINKS AND VITAMINS RIGHT?

I AM VERY CONFUSED I HAVING BEEN HEARING SO MANY DIFFFERENT STORIES.WHAT ARE WE SUPPOST TO EAT OR DRINK .AFTER SURGERY I KNOW PROTIEN DRINK IS THAT CONSIDERED YOUR LIQUID?? DOES YOUR SURGEON GIVE YOU ALL THESE INSTRUCTIONS OR ARE YOU ON YOUR OWN?? HELP PLEASE

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