Will this dehydrate me.!

Question: Will this dehydrate me!.
if i drink coffee the day before i give blood will it make my vains to small and dehydrate me!?Www@FoodAQ@Com

It will be out of your system by then!.Www@FoodAQ@Com

It shouldn't unless you don't drink anything but coffee and/or have weak veins that normally give doctors trouble!. Www@FoodAQ@Com

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