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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.
Emotional Factors. A variety of emotional factors can cause your stool to become yellow in color. In most cases this is a sign that food moved through the body too quickly, causing the body to develop diarrhea. Your stool will turn yellow because of the presence of bilirubin created by the liver and fat in the stool.