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.
“Hearst Magazines and Verizon Media may earn commission or revenue on some items through the links below.” If you check out the toilet bowl after you go No. 2, well, join the club: People are ...
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