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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.
Your stool can be yellow because of your diet. Some causes of this are eating foods high in food coloring, carrots, or sweet potatoes. It may also be from certain gluten products or a diet high in fats.