my experience with blueberries is more green than black, though if the skins aren't being broken down there is definate blackness going on too. Cut out the b-berries for a day or two and see if that makes a difference...otherwish black poo isn't usually normal/ok.
Yup! DD eats blueberries like crazy and her poo is always a blackish color. I freaked out a little at first, but I finally realized what was going on-no worries.
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Re: do blueberries turn poop black?
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Yep. Well, my DS gets blue-black poop after blueberries.
Three of his favorite foods are blueberries, raisins, and black beans. Not fun.