Yellow stools are normal. The color of the stool has more to do with the diet. If you eat food with high pigmentation, the color of the stool will change accordingly. It is not normal to have black, white, or bright red stools when you are eating a normal diet. Healthy stools are usually yellow or brown in color. It is more yellow when more carbohydrates are consumed and more brown when more protein is consumed. The color of the stool is linked to the diet, such as eating a purple dragon fruit, animal blood, mulberry and other such foods, the color of the stool will change accordingly. In the case of a normal diet, the color of the stool changes, may be the phenomenon of disease. Such as black stool, also known as tar-like stool, mostly seen in the upper gastrointestinal tract bleeding; bright red stool is mostly seen in the lower gastrointestinal tract bleeding, hemorrhoids, intestinal polyps, anal fissure. If the color of the stool is abnormal, it is recommended to go to the hospital for a stool examination to determine the cause of the disease.