Gray stools, pale stools, putty or clay colored stools may be seen in hepatitis, gallbladder disorders, or malabsorption conditions. Bile salts in the stool excreted by the liver give it a normal brown color. Obstruction to bile flow out of the liver (you may see the word "cholestasis"), or liver infections like viral hepatitis (A, B, C, etc.), may produce clay colored stools. Possible causes for clay colored stool result from problems in the biliary system (the drainage system of the gallbladder, liver, and pancreas): Malabsorption problems can cause undigested fat in the stool (steatorrhea) which is characterized by foul smelling, light yellow to gray, greasy or frothy stools. This may also be caused by low bile output.
Stool starts out green , then turns bright yellow as it goes through the digestive tract. It is bile and bacteria that finally turn it brown. Yellow or green stools can indicate stool is passing through the digestive tract too rapidly not giving it a chance to change colour. Bright yellow stools can also indicate not enough bile / bilary obstruction.
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