Constipation
While the faecal matter stays in the large bowel, water is gradually absorbed, making it harder and drier.  Constipation occurs when the faecal matter becomes very hard and difficult to move, due to slow progression through the bowel or infrequent clearing.

This means the causes of constipation can be traced back to inadequate consumption of water, lack of dietary fibre (as found in fruit), or slow or impaired movement of the bowel.