Human feces is a combination of water, bacteria, parts of cells that line the digestive tract, and undigested food components, such as fibers. The coloring of feces is attributable to several of the substances that are removed from the body in the feces. For instance, when the body breaks down hemoglobin, coloring pigments are produced. These substances become part of bile, which empties into the digestive tract. These add color to the feces.
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