Why do stools vary in size?

Stools vary in size due to several factors, including diet, hydration levels, and the efficiency of the digestive system. A diet rich in fiber typically results in larger, bulkier stools, while a low-fiber diet can lead to smaller, harder stools. Additionally, hydration influences stool consistency; adequate water intake helps to soften stools, while dehydration can lead to harder, smaller stools. Individual differences in metabolism and gut health also play a significant role in stool size.