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Dr. Julie Abbott Dr. Abbott. Not necessarily: A yellowish stool can mean there is excess fat in the stool. When you take probiotics you are altering the bacteria in the intestine, so stool changing color would be common, though not necessarily green. Green is sometimes associated with food moving through the large intestine too quickly, with incomplete processing by bile.
Bile that is chemically changed by bacteria in the intestine can be greenish-brown. It takes time for the bile to be fully changed in the intestine and become brown again, and if the transit time is short, the stool remains green colored. Green stools may be a normal variant. It can also be caused by a diet rich in green vegetables, especially spinach. Iron supplements also may be a cause, though iron often turns stool black.