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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 (yellow or grey) can signify a problem with the liver or gallbladder, so if you have persistently light-coloured stool, then you should see your physician. Green: Most often, green stool is the result of ingesting large quantities of green foods, such as leafy greens or foods with green colouring added.