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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.
Tan colored stools suggest you may have difficulty digesting your fats, which causes congestion in the liver and gall bladder. IBS and yellow stools sometimes occur. Gray/white ashy colored or clay like stools can indicate pancreas or liver problems. Also, possibly gallstones pancreatitis or cirrhosis of the liver.