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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.
Possible causes of tan colored stool. Bilirubin is the substance processed by liver and mixes with bile. Bilirubin is produced by breaking down of old red cells. In the bile, bilirubin is carried by bile ducts from liver to gallbladder and then to small intestines where it will mix with partially digested food.