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 Nobody likes to talk about this. The color of your stool matters because it leaves behind clues on your digestive health. When digestion is working well, bile flows properly, fats are absorbed, Dark Stools and Abdominal Pain: A Case Study of Mr. Arnold's Course Hero A mixture of normal stool and melaena (black section of stool in the Download Scientific Diagram