Indeed, some who ate a lot of cookies say the dye turned their feces various shades of pink, from “bright pink” to “reddish-pink,” reports BuzzFeed; BuzzFeed employees who ate only one cookie say their bowel movements were no more colorful than usual. While Oreo has yet to comment, USA Today previously reported that stuffing your face with foods heavy in dyes can produce “a greater spectrum in your rectal rainbow.” In 2015, for example, people who ate a Halloween-themed Burger King Whopper with a black bun complained its concentrated dye made their excrement “as green as the Irish countryside.” A doctor at the time suggested it was nothing to worry about. Reddish stool should be checked by a doctor, though, as it could be a sign of internal bleeding.

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