After eating mulberries, some patients may experience black bowel movements or normal bowel movements. Mulberry contains zinc, iron, calcium, selenium, potassium, manganese and other minerals and trace elements needed by the human body, but also contains carotene, glucose, cellulose, vitamin B1, vitamin B2, etc., because of the presence of iron, if consumed in excess may result in the iron with the fecal discharge, resulting in some people will appear to have a change in the color of the defecation, the appearance of black stool. Mulberry itself contains natural pigments, if excessive intake can lead to black stool color, will not have any effect on the body, control the amount of food, drink more water, limit the intake of mulberry, the color of the stool can be returned to normal. If you eat a blackberry, you need to rule out the existence of other factors that appear black, such as the existence of gastrointestinal bleeding, etc., to find out the reasons for timely treatment.