These tend to be low in fiber, so they may help cause constipation. In addition, bad teeth may cause older people to choose soft, processed foods that contain little, if any, fiber. People sometimes do not drink enough fluids, especially if they are not eating regular meals. Water and other liquids add bulk to stools, making bowel movements easier. Misuse of laxatives and enemas.
Many people think of laxatives as the cure for constipation.
But heavy use of laxatives is usually not necessary and often can be habit forming. The body begins to rely on the laxatives to bring on bowel movements and, over time, forgets how to work on its own. For the same reason, if you use enemas often you may lose normal bowel function. Another side effect of heavy laxative use is diarrhea. Other causes of constipation.