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MediGuard answeredIf extra fiber is taken in from food sources your stool color could change depending on the quantity and type of food eaten. If the fiber increase is the result of an over the counter medication like Fibercon changes in your stool could happen as well. If your stool continues to have a dark appearance for greater than 2 days you should contact your doctor to discuss and be evaluated. There could be other reasons you are seeing a change in your stool and your doctor will be able to determine possible causes.