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Yellow/Pale Brown/Grey: Bright yellow diarrhea can signify a condition known as Giardiasis (see sidebar). Stool that is yellow or pale can also result from reduced production of bile salts, since a normal, brown-coloured stool acquires its hue from breaking down bile.
Yellow Bowel Movement â Causes, Symptoms, Treatment. Normal color of the stool of feces is varying shades of brown. A chemical called bilirubin causes the brown color for the bowel. Any difference in the concentration of bilirubin can cause variation in the color of bowel movement ranging from light yellow to black. Sometimes your stool can become green or greenish yellow in color. If the stool becomes very thin and watery its color can turn light yellow to dark yellow. The food you eat can also cause change in color of the bowel. Bacteria and other enzymes of the abdomen can also change the color of bilirubin.