Generally speaking, eating chestnuts stool does not become black. Chestnuts are a common nut, soft and nutritious, as a food, chestnuts do not have the efficacy of healing, but also generally does not lead to the occurrence of black stools. There are many reasons for black stools, some gastrointestinal tract lesions may lead to black stools, such as congestive gastritis, intestinal polyps, gastric polyps, and gastrointestinal tract malignant tumors. Secondly, if you eat black or dark red food, which is not fully digested, it may also lead to black stools. Specifically need to go to the regular hospital for further examination. Because eating chestnuts generally does not lead to black stools, so if you find a black stool, you should immediately consult a doctor to rule out whether it is caused by organic lesions. In addition, the chestnut allergy crowd prohibited the consumption of chestnuts, and chestnuts should not be eaten, so as not to aggravate the burden on the stomach and intestines.