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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.
Pale Stool High Fiber Diet. Abnormal appearing stool may be caused by a diet that is low in fiber. Dietary fiber is a plant material that humans cannot digest. Fiber is made of large carbohydrate molecules that pass through the intestinal tract without being used by the body.