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Green: 1  Green stools are always normal, but they can be mistaken for black stools. 2  Bile. Most dark green stools are caused by bile. 3  Green stools are more common in formula fed than breastfed infants. It can be normal with both.  Green stools are more common with diarrhea. This is due to a fast transit time through the gut.
Stool is normally brown due to the digestion of bile salts, which are produced in the liver and stored in the gallbladder. A reduction in bile salts due to liver disease, gall stones, and other conditions causes the stool to be pale. Dark stool can be due to dark foods, medications, or supplements, or may be due to digestive tract bleeding, which can result in red, maroon, or even black, tarry stool.