MEASURES TO PREVENT CONSTIPATION:

The keys to preventing constipation are simple enough. You should drink adequate amounts of water. Six to eight glasses a day is a good rule.

Also, get sufficient fiber by eating:
*Fruits
*Vegetables
*Grains
Fiber is critical, because most of our stool is actually made up of bacteria, and fiber provides the bacteria a good place to grow. Sounds strange, but the interaction results in a larger volume of stool and better bowel function.

Also, be sure to exercise regularly.