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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.
This stool may look like a pale yellow, or off white. Pale and yellow stool: may indicate the presence of undigested fat in the stool. Such conditions as pancreatitis (inflammation of the pancreas) or pancreatic cancer can prohibit the absorption of fats by the body, resulting in fat-laden and pale stool. This type of stool often has a greasy texture and foul smell.