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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.
Yellowish or greenish stools that are greasy and foul smelling may be due to malabsorption disorders, such as celiac disease, or parasites such as giardia when. accompanied by diarrhea. Tan colored stools suggest you may have difficulty digesting your fats, which causes congestion in the liver and gall bladder.