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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.
A reduction in bile salts due to liver disease, gall stones, and other conditions causes the stool to be pale. Dark stool can be due to dark foods, medications, or supplements, or may be due to digestive tract bleeding, which can result in red, maroon, or even black, tarry stool.