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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.
Yellow stool is typically due to an excess of fatty foods and grease in the diet. Mayo Clinic states that it can also be caused by a malabsorption disorder such as celiac disease.