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Stool color is generally influenced by what you eat (e.g. green leafyy vegetables or green food coloring can turn stool green), as well as by the amount of bile — a yellow-green fluid produced by the liver that digests fats — in your stool. As bile pigments travel through your gastrointestinal tract, they are chemically altered by enzymes, changing the pigments from green to brown If the bile travels through the GI tract rapidly (e.g due to infection or diarrhea), it can stay greenish in color. If it does not persist for more than a couple days, it was probably something you ingested. If it persists, or you develop other symptoms such as abdominal cramping, you should see your family docotor for a complete evaluation.