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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.
Often, it is nothing to worry about. For example, Christmas-colored stool -- green and red -- can result from lime gelatin, drinks and ice pops containing green food coloring, or from consuming beets and drinks dyed with red food coloring. Pale stool, however, may signal something serious.