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Yellow/Pale Brown/Grey: Bright yellow diarrhea can signify a condition known as Giardiasis (see sidebar). Stool that is yellow or pale can also result from reduced production of bile salts, since a normal, brown-coloured stool acquires its hue from breaking down bile.
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.