Eating eggplant usually does not change the color of stools, but eating too much of it sometimes does, but the color will not be too heavy, and it will return to normal within 2-3 days after you stop eating eggplant. The black color of the stool may be due to irregular diet and indigestion, and often constipation will also appear black stool, irregular diet can be changed by adjusting the diet, indigestion, you can take drugs to promote digestion. Constipation can take medication for constipation, along with dietary therapy to assist in the treatment, soon the stool will return to normal color, and at the same time to take into account the cause of bleeding, you can go to the local regular hospital to do a gastroscopy. With physical examination and patient self-reporting to confirm the diagnosis, after the diagnosis can be based on the cause of bleeding control treatment, if necessary, to take the surgical way.