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What is the most common causes of green bowel movement in adults?

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Some common causes for green bowel movements in adults are eating green vegetables, iron supplements and bile, as noted by Mayo Clinic. A common cause of green stool can be a diet that contains large amounts of green vegetables, such as spinach and broccoli. Taking iron supplements can also lead to green bowel movements.

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Green food coloring found in ice pops and green-colored drinks can also lead to this color of stool in adults. Another reason for green stool, which should not cause any concern, is due to bile not breaking down completely. Bile, which is stored in the gallbladder, is a greenish fluid substance produced by the liver. Bile's function is to metabolize fats in food. When food passes through the large intestine too quickly, bile does not have enough time to degrade, giving stool a green color instead of it being brown, states MedicineNet.

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