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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.
When the amount of bile salts is significantly reduced or they are absent, the stool can be pale yellow or grey. Liver disease can interfere with bile salt production, and anything that blocks the bile ducts can prevent bile salts from reaching the intestines. Fats can also cause the stool to be yellow. Excess fat in the stool can be due to decreased fat digestion, which can occur with conditions involving the pancreas or decreased absorption in the intestines, which can occur with some intestinal conditions.