Stool Colors and What They Can Tell You Your stool color can carry important clues about digestion, diet, or even disease. Most shades are harmless, but some changes signal the need for Black, Green or Bloody: What's Up With My Poop? Diet vs Disease Stool Colors and What They Can Tell You Your stool color can carry important clues about digestion, diet, or even disease. Most shades are harmless, but some changes signal the need for Why Black Dark Brown Tarry Stool Appears After Wearing Hair Nets And How This One Product Why is my poop green? Stool colors explained