Eating too much Oreo can lead to black stools, related to the failure of Oreo to be fully digested, a small amount of consumption usually does not. A small amount of Oreo consumption usually does not cause black stools, but if a large amount of Oreo is consumed and indigestion occurs, and a large amount of Oreo in the body is not fully digested and absorbed, the remaining black residue adheres to the feces, which means that black stools occur. In addition, there may be other causes of black stool, such as peptic ulcer and other diseases with gastrointestinal bleeding, or taking bismuth, iron and other drugs may also cause. Note that there may be other causes of black stool, we recommend that patients go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment, prohibit the use of private medication.