I was part of a study where researchers tracked how long it took blue food dye to move through my system. Hilary Brueck/Insider I turned my poop blue for science (well, sort of), and you can too.

My receptionist Mandy came scurrying into the office: “Doctor, Mrs. Ferris is on the phone and she says she needs to bring her mother in right now because of a blue stool.” Sometimes I’m a little slow ...

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