Maybe...but: Yes (as answered previously on healthtap), depending on amount of blueberries consumed, other ingestants, & transit time of your gut. However dark stools may also & more significantly indicate bleeding from some site in the GI tract, or ingested blood. Please don't ignore this possibility. A check of hemoccult or equivalent should be performed, & if positive a GI work-up should be undertaken soon.
Answered 6/10/2014
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