Which of the following is a common cause of constipation?

Dehydration is a common cause of constipation because adequate fluid intake is essential for maintaining the proper consistency of stool. When the body is dehydrated, it absorbs more water from the intestinal contents, leading to harder, dry stools that are difficult to pass. This can slow down bowel movements and result in constipation.

In contrast, increased fluid intake typically helps to prevent situations that lead to constipation by keeping stools soft and easier to eliminate. Regular exercise also promotes healthy bowel function by stimulating intestinal contractions. A high-fiber diet contributes to regular bowel movements by adding bulk to the stool, making it easier to pass. Therefore, it is critical to maintain good hydration to support effective digestive health and avoid constipation.