Eating ugali will stain the stool. Ugali is a high-protein food and the stool will empty more slowly after eating, resulting in black, sticky stool, but be careful to exclude gastrointestinal bleeding. When there is a black color of stool, go to the hospital for a fecal occult blood test, and if it appears positive, be highly alert to gastrointestinal bleeding. If the amount of gastrointestinal bleeding is >50mL, black or tarry stools will appear. There are many factors for the clinical occurrence of the above symptoms, but care should be taken to identify them. In addition, if certain medications, such as those containing iron, bismuth or animal blood, are taken at the same time when eating uglium, a change in stool color may also occur and should be screened. In daily life, we should pay attention to the color of the stool, eat warm, soft, light and easily digestible food, and if there is any abnormal color or nature of the stool, we should be alerted and promptly examined and treated to prevent delaying the disease.