A stool shaped like a banana or a sausage is normal, and the color is usually brown or yellowish. If the stool is nut-like, one grain at a time, it indicates constipation. If the stool is soft and mushy, it may be diarrhea. If the stool is watery, it indicates severe diarrhea. A healthy person’s stool is slightly smelly, and a normal bowel movement is once a day. If the stool is brown, it means that there is a lack of fiber in the body, so you should eat more vegetables to supplement it. Sometimes the color of the stool may be related to the color of the food eaten, if you eat a lot of food containing red pigment, such as tomatoes, carrots, the stool will appear red, but these are normal. After eating small amounts of these foods, the stool will return to its normal yellow or brownish color.